Develop Bugs

Need to send audio to my BT handset (willing to pay $$)

Hi guys
I've recently purchased an XDA IIs and i just love it! I also got a JabraBT800.
I've got Destinator 3 and was wondering if there was any way I could use the BT headset to play the destinator voice prompts, and infact, all other audio (including audio recordings on the XDA and other audio such as mp3's etc.)
I know the quality wont be good when listening to mp3's but quality doesnt matter.
I'm sure there would be a workaround to using the headset for this purpose? I've searched the 'net all over and have not been able to find anything!
HELP!! I'm willing to pay $ in order to get this working!

Anyone??

Here is the magic key, that gets me very close, with a temporary shift of sound to the Jabra 250, then back to the internal speaker. Maybe other headsets can keep the sound transfer or someone can find the next step to get this stable.
HKLM\Software\Widcomm\Plugin\Handsfree
Change AudioPreferences to (3)
Change AudioHandling to (19)
Make sure SupportedFeatures is (55)
What did this change?
Go to Bluetooth Settings, Services, Hands Free, and hit the Advanced button. Notice the whole new checkbox called "Standard Audio" and paragraph about playing music, notifications, etc. on your headset.
My Jabra now is labeled an Audio Gateway in the Bluetooth manager. Still works for phone calls, partners and begins to transmit standard audio with every sound. Just reverts back in internal speaker after 1/2 second of sound or so.
Good luck with the next steps. I noticed there is a AudioGateway device defined in the registry using AudioGateway.dll There is also an BTAudioGateway.dll, but it is not defined anywhere in the registry, maybe this is a key registry setting that is missing.

Anyone got more info on this? It seems the feature is there, we just need a way of making this perm!

Thanks for that info Paul.
I tried it and I did get the 'Audio Gateway' setting in my BT settings page. However, I could not get the 1/2 second audio at all.
Connection status also showed no activity sent while audio was playing on my XDA IIs.
Has anyone gotten this working at all? (Even the 1/2 second audio bit)?

I changed the keys, and the new check box appeared. I did not notice any audio, but im not sure when it was expected....I.e. when you change the keys or when u check the tick box. Not sure....
The feature seems to be there, and would love to have this functionality, and to be able to use the bluetooth's mic for recording on the device would also be great, i.e for Voice Commands etc.....

Any developers willing to take on this project?
I'm willing to donate $100 to the first person that comes up with a workable solution!

A tip free of charge:
http://www.pocketkai.net/asp/details.aspx?101
Only in German, probably in English, haven't checked.
Cheers

I dont see how my question and the link you provided are related...

BT Headset patch
I think he meant:-
http://www.pocketkai.net/asp/en/details.aspx?261
But it is device specific....

Yes, in fact I did.
Hope this helps.

Where and how do you locate the directory HKLM\Software|Widcomm|Plugin|Handsfree to make the changes?
Paul_Hammons said:
Here is the magic key, that gets me very close, with a temporary shift of sound to the Jabra 250, then back to the internal speaker. Maybe other headsets can keep the sound transfer or someone can find the next step to get this stable.
HKLM\Software\Widcomm\Plugin\Handsfree
Change AudioPreferences to (3)
Change AudioHandling to (19)
Make sure SupportedFeatures is (55)
What did this change?
Go to Bluetooth Settings, Services, Hands Free, and hit the Advanced button. Notice the whole new checkbox called "Standard Audio" and paragraph about playing music, notifications, etc. on your headset.
My Jabra now is labeled an Audio Gateway in the Bluetooth manager. Still works for phone calls, partners and begins to transmit standard audio with every sound. Just reverts back in internal speaker after 1/2 second of sound or so.
Good luck with the next steps. I noticed there is a AudioGateway device defined in the registry using AudioGateway.dll There is also an BTAudioGateway.dll, but it is not defined anywhere in the registry, maybe this is a key registry setting that is missing.
Click to expand...
Click to collapse

hi
i phurchase the kais patch for bt but its didnt help and not working

It is a registry setting, not a directory. I used Raxco Registry editor for it, but there are many others available.

It appears the problem is missing registry keys. On the PDAPhoneHome.com forums one of the members decompiled the audio gateway DLL and the bluetooth audio DLL and found that they are looking for registry keys that dont exist, namely the contents of HKLM\SOFTWARE\Widcomm\BTConfig\Services\0005 and HKLM\SOFTWARE\Widcomm\BTConfig\Services\0006. The IPAQ and Axims that have this capability already have these keys defined. So the question is, does anyone have a PPC (Not necessarily a Blue Angel or even an HTC) with these keys defined in the registry?

Hi guys
Any updates on this?

yep check this thread

Having problems with A2DP? I can help.

A couple nights ago, I was intent on getting my A2DP to work perfectly. I wanted clear, crisp, skip free music coming from my phone. Using this method, I have done just that. I'm not 100% sure all of the steps I'm including are necessary, but I've done this twice and it worked perfectly both times. Here goes!
Short way, But I'm not 100% sure it will work as well
1. Navigate to "LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings" in the registry.
2. Set BitPool to 48, MaxSupportedBitPool to 56, and Use Joint Stereo to 0.
3. Exit, soft reset
4. Tell me if it works well for you or not...
Long but guaranteed way
1. Download HTweakC, install
2. Go to bluetooth tweaks, set audio quality as "Excellent"
3. Install Sleuth255's A2DP Fix cab then soft reset
[By this point, the A2DP is crackly and may skip...so continue]
4. With the registry editor of your choice, navigate to the following:
LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings
5. Change the value of "Bitpool" to 56
6. Change the value of MaxsupportedBitPool to 56
7. Change "Use Joint Stereo" to 1
8. Soft Reset
9. Uninstall Slueth's A2DP fix
10. Soft Reset
11. Once again, open HTweakC
12. Change the A2DP quality to "High"
13. Soft reset
14. Enjoy crystal clear, skip free streaming music.
Also, if anyone can help me with an issue I've been having...Is there a quick way to set a pair of bluetooth headphones to automatically set itself as as wireless stereo without applying it each time in bluetooth options? I have a pair of BT620's if that makes any difference.
And
Is there a way to have WMP startup with my storage card's library by default? If not, is there a way to delete the library from My device?
Thanks! Hope this helps!

Has this technique eliminated the hissing aswell dude?
(No A2DP hardware to test sorry )

I have now done exactly as the "long" way said, and it did not take away the hizzing sound, (not with my plantronics pulsar 260 anyway)
so it is back to the drawing board!
thanks for sharing this Centurion, it is always nice to hear success stories..
but I would believe that the last step is the only one neccessary (htweakC)
too bad it didn't work for me.

The hissing on mine is definitely gone...I wish I could share it with you.

Hi, I just got my X01HT last week. May I ask which Windows Media/MP3 player program are you using to listen with stereo bluetooth?? I can't find the function in Windows media Player.
Thank you very much!

Hi, Pingubest
You can not use the function of stereo bluetooth on the default OS of X01HT.
In this case, you must apply cab files for the A2DP function or install WM6.

Using WMP...I've tested this 3 times on my phone now after 3 different flashes and it worked each time.

Centurion said:
Short way, But I'm not 100% sure it will work as well
1. Navigate to "LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings" in the registry.
2. Set BitPool to 48, MaxSupportedBitPool to 56, and Use Joint Stereo to 0.
3. Exit, soft reset
4. Tell me if it works well for you or not...
Long but guaranteed way
1. Download HTweakC, install
2. Go to bluetooth tweaks, set audio quality as "Excellent"
3. Install Sleuth255's A2DP Fix cab then soft reset
[By this point, the A2DP is crackly and may skip...so continue]
4. With the registry editor of your choice, navigate to the following:
LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings
5. Change the value of "Bitpool" to 56
6. Change the value of MaxsupportedBitPool to 56
7. Change "Use Joint Stereo" to 1
8. Soft Reset
9. Uninstall Slueth's A2DP fix
10. Soft Reset
11. Once again, open HTweakC
12. Change the A2DP quality to "High"
13. Soft reset
14. Enjoy crystal clear, skip free streaming music.
Also, if anyone can help me with an issue I've been having...Is there a quick way to set a pair of bluetooth headphones to automatically set itself as as wireless stereo without applying it each time in bluetooth options? I have a pair of BT620's if that makes any difference.
QUOTE]
I don't see any logic for the steps 9-14?? Maby you soft reset to quickly or didn't save registry values properly. I usually wait a little the use the powerbutton to close down phone.
Step 5-6 I set to 52 (decimal!) and sound is great on HBH-SD970 and skipping never happens as long as there's not an object between the phone and headset. I'm running Black 2.5 on a Tytn.
Regarding the problem with the BT620, this seem to be ralated to that headset, I don't have that problem with HBH-SD970. Maby there is some firmware upgrade for your headset?
Click to expand...
Click to collapse

I think the stereo thing has to do with your headset also since my BT8010 works correctly also..

I concur Jompao, no problems with HBH-DS970's... no hiss and clicks nearly eliminated with Custel's latest 1236 build v1.2. Also sound with this latest release seems louder than the previous 968 builds. Save some battery power on my DS970's... sweet!
Cheers

A2DP
I followed the "long steps" and it doesn't work for me. I am using Samsung WEP200.

doesn't work on mt 8525. It just makes the skips worst!!!!!!

the new lwsv rom is quite intresting seen from a a2dp level, it made my headset work almost as good as widcomm stack, although with the advantages of ms stack !

a2dp
Hi just to let you know "your way" - works BUT only if you DONT remove sleuth's fix - take it out and its all miss and no hits but leave it runnin and its gr8 .
ps running Moto HT820
regards
jon

mrvanx said:
Has this technique eliminated the hissing aswell dude?
(No A2DP hardware to test sorry )
Click to expand...
Click to collapse
I have perfect stereo sound! It's all in the BT headsets you use.
I use the Nokia HS-12W and HTC BH S100 and the sound is as good as it gets. NO BACKGROUND NOISE AT ALL.
It's about matching the A2DP specs of the headsets to the M$ software, and not the other way around.
My opinion only, for what it's worth.

Can anyone explain what the values of MaxsupportedBitPool and BitPool stand for? Are they kbps or decibles or something else? I understand changing the UseJointStereo to 0 turns off Joint Stereo, but i want to know what the BitPool stands for.
I have a Motorola HT820 and can play music through it with no problems. I changed the 2 bitpool settings to 48. This definately improved the quality, but occasionally it skips (very rarely). So are these higher numbers causing too much data to stream and you get a "buffer" type pause.
Also if I convert back to Joint Stereo, will that cause 1/2 of the data stream, since its basically mono. If I could stream at 96 kbps in mono, compared to 48 kbps in stereo, I would choose the mono. Mainly because of the sounds of the high frequencies. The bass and mids sounds great.
On a side note I found that turning my phone's and windows media players volume all the way up improves the sound. I use the volume controls on the HT820 to control volume.

Ok, I didn't get very far with this fix...
I downloaded and installed HTweakC, but when I run it I get an error; HTweakC.exe "Argument out of range Exception". I am assuming that the bluetooth tweaks are in this proggy?
I also tried the shortcut way, but I don't have "LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings" in the registry.
WTF did I do wrong here??
Any ideas?
I have
Cingular 8125 Wizard
G3 CID/SIM Unlocked
Rom Version: WM5SE rev 4.0 - WM5 without stylus but style!
2.26.10.2 WWE
IPL: 3.08
SPL: 3.08

Ok, One more thing...
I just went to my vehicle to play around some more and I found that when I have the BT stereo playing and a call comes in, the stereo is paused until the call is done and when it starts back up I either have no sound at all or it's skipping badly, but I went to the bluetooth device settings and held the click for the sub menu and then selected Set as wireless stereo, the audio straightened out and started playing fine again.
Could this mean the processor is too slow in the Wizard? Maybe if I overclocked it a bit that might help or am I just doomed to never have this work correctly?
Thanks again!

Can NO ONE answer my question above?
It looks like this thread is dead??
I really want to solve this audio skipping problem if posible!
Thanks
ITAdmin

Centurion said:
Short way, But I'm not 100% sure it will work as well
1. Navigate to "LOCAL_MACHINE/Software/Microsoft/Bluetooth/A2DP/Settings" in the registry.
2. Set BitPool to 48, MaxSupportedBitPool to 56, and Use Joint Stereo to 0.
3. Exit, soft reset
4. Tell me if it works well for you or not...
Click to expand...
Click to collapse
Magic!!!!
I have been battling with this for weeks. Finally something that works.
Many thanks for sharing that.

Universal and Jabra BT620s problem

Hi everyone. Not long time ago I bought T-mobile MDA Pro. I guess it's German version since it have QWERTZ keyboard layout.
It has some issues, but it was all software and I fixed it. But I have one problem that I couldn't solve my myself.
I have bluetooth headset Jabra BT620s. Bought it specially for using with my Universal (it's not handy to talk by phone with it in hands). Connected, added as Headset. Everything cool... have to be. But! It plays sound (as headset) this way: 1-2sec playing 30-40 sec silent. I didn't try hands-free because it have no use without listening to music. What had I try:
1. Different ROMS
- WM5 WWE 1.30.77 (if remember number right)
- WM6 J's WWE 2.02.02
- WM6 WWE 2.10.02
ALL ROMs had this issue
2. On every ROM I tried to change "priority" for A2DP (via RegEditor)
One thing helped me. Got broadcomm BT stack application (same was with WM5 ROM, but it seems different version). A2DP worked fine, hands-free too (as you remember I didn't try it without A2DP), BUT(!) all sounds via speakers and headphones (of course, when Jabra was offline) disappeared and my universal becon unresponsive and hanging up often. So I couldn't use it.
Maybe you can help me to solve the problem? Maybe I have to use different BT stack? Or try something with registry? Or... I have no idea.
And, by the way, does anyone knows which broadcom chip is used in Universal? Where can I get all specs (chipset e.t.c.)?
Thanks

Hi,
I had the same problem with my Universal and my Laptop too.
I thought it was a lack of memory problem but trying "light" player nothing changed...
I think that it could be related to pairing problems and the way Jabra BT620s activate BT profiles, because everything got solved restarting Jabra and activating Headset profile before the A2DP.
I solved definitely all the issues with Jabra BT620s using the new firmware with WM6 5.2.1413 and Microsoft Stack (with bitpool set between 30 and 36).
I hope being helpful.
Let me know if you have any interesting tricks...

Hi! Thanks for posting!
I forgot to write that I always trying to activate hands-free firs then headset. And all after powering on Jabra.
Ok. I tried to update firmware of jabra (as topic somwere nearby tells) and connect. Problem persists.
I'm not kinda pro in BT, so tell me what is _bitpool_? And how to set it?
I will google for sometime, of course, but if I won't find that, please, write. Does this mean to mess with registry?

alexkass84 said:
Hi! Thanks for posting!
I forgot to write that I always trying to activate hands-free firs then headset. And all after powering on Jabra.
Ok. I tried to update firmware of jabra (as topic somwere nearby tells) and connect. Problem persists.
I'm not kinda pro in BT, so tell me what is _bitpool_? And how to set it?
I will google for sometime, of course, but if I won't find that, please, write. Does this mean to mess with registry?
Click to expand...
Click to collapse
That is in the Registry. I got the info from somewhere (Sorry cannot remember?) But I copied it to a text file, here it is: [HKLM/Software/Microsoft/Bluetooth/A2DP/Settings]
Add new dword, Value name=BitPool; Value data=48 (Decimal)
Modify, Value name=UseJointStereo; Value data=0 (Decimal, Originally 1)
For BitPool:
Microsoft suggests the following bitpool values for optimal buffer sizes.
30 - Low audio quality
40 - Medium audio quality
48 - High audio quality
58 - Excellent audio quality
Choosing 48 is adviced.
For UseJointStereo: use 0 instead of 1 else the streaming is done only in mono mode!
(I have a 8525 so AD2P came with it. I never added any entries I just changed the #'s. )

Gonna try it today, when back from work.
I understand that reducing quality gives better stability and performance. But I want true stereo, not joint.
Ideally I want get same sound as I'd have in wired headphones.

I have the same problem with this headset, after 6 hours testing, severals flashings with the best wm5&wm6 roms, i cant make it work!
Please help, i had changed the bitpool from 30 to 60, one up at a time (30,31,32...60) nothing happens.
I heard half sec music and then silence. WTF???

try to use widcomm stack. but the quality of music in mine headset using this stack is not very good. and there are some bugs such as no sound after disconnecting the jabra. if you find some solution, please post it here!

widcomm stack works great, finally after 6+ hours i heard sound from my headset! The sound is pretty good, also when i turn off the headset, the sound playback from the device.
f#ck you M$ with the crapy bt stack, i have lost half day.
Thank you l2tp.

Solved!
It was a bitpool. Little gude:
It was my WM6, so no keys were added.
Use registry editor
[HKLM/Software/Microsoft/Bluetooth/A2DP/Settings]
Value name=BitPool; Value data=48 (Decimal, Originally 30)
Value name=UseJointStereo; Value data=0 (Decimal, Originally 1)
Value name=MaxSupportedBitPool; Value data=500 (Decimail, Originally 30)
As I figured out, MaxSupp is some kind of "cache". When I tried 100, it became laggy after 30-40 minutes. But with 500 2hours played perfectly.
But! Have to solve 2 more problems:
1. Bad connection.
I'm carrying my Uni in bag and when comething getting in the way between bag and my head (i.e. my hand when I taking something form the bag) sound dissapears for 1-2-3 sec. It's not nice.
Maybe I should try widcomm stack? The question is where I can get it and what the type it should be? (don't post please "on widcomm site", give me as widcomm.com, I just can't search for now)
2. It's too quiet.
Wired headphones were pretty louder. Since I using subway 1.5 hours per day you can imagine that without 100% volume I can't hear the music normally.
I put Jabra on 100% and Uni 100% volume. But it like 50% of wired headphones' volume.
Should this be normal (Jabra less quiet), or can I do something?
YES! I know how it works, that Jabra have internal amplifier and BT signal decoder, but...
Of course, I don't wans to dissassemble Jabra and making hard additions to it (unless it will be a kind of volume regulator).
I need that Jabra played for nearly 5 hours. So I can spend attioional power of Jabra (in manual said that It can play for 14 hours, so I can get 195% boost in power).
Thanks everyone participated in this tread.
Argh! The M$ stack gives me creeps. Very unstable. It seems, that my Uni have not BT but some kinda radio transmitter back from WWII! Loosing signal in distance less than meter! I alwayes hated, will hate always M$ corp. OpenSource rules the world!

alexkass84 said:
Solved!
It was a bitpool. Little gude:
It was my WM6, so no keys were added.
Use registry editor
[HKLM/Software/Microsoft/Bluetooth/A2DP/Settings]
Value name=BitPool; Value data=48 (Decimal, Originally 30)
Value name=UseJointStereo; Value data=0 (Decimal, Originally 1)
Value name=MaxSupportedBitPool; Value data=500 (Decimail, Originally 30)
As I figured out, MaxSupp is some kind of "cache". When I tried 100, it became laggy after 30-40 minutes. But with 500 2hours played perfectly.
But! Have to solve 2 more problems:
1. Bad connection.
I'm carrying my Uni in bag and when comething getting in the way between bag and my head (i.e. my hand when I taking something form the bag) sound dissapears for 1-2-3 sec. It's not nice.
Maybe I should try widcomm stack? The question is where I can get it and what the type it should be? (don't post please "on widcomm site", give me as widcomm.com, I just can't search for now)
2. It's too quiet.
Wired headphones were pretty louder. Since I using subway 1.5 hours per day you can imagine that without 100% volume I can't hear the music normally.
I put Jabra on 100% and Uni 100% volume. But it like 50% of wired headphones' volume.
Should this be normal (Jabra less quiet), or can I do something?
YES! I know how it works, that Jabra have internal amplifier and BT signal decoder, but...
Of course, I don't wans to dissassemble Jabra and making hard additions to it (unless it will be a kind of volume regulator).
I need that Jabra played for nearly 5 hours. So I can spend attioional power of Jabra (in manual said that It can play for 14 hours, so I can get 195% boost in power).
Thanks everyone participated in this tread.
Argh! The M$ stack gives me creeps. Very unstable. It seems, that my Uni have not BT but some kinda radio transmitter back from WWII! Loosing signal in distance less than meter! I alwayes hated, will hate always M$ corp. OpenSource rules the world!
Click to expand...
Click to collapse
Suddly or not, MS rules the computers world.
I cant understand why the p3300 works fine with jabra bt620s, and it has wm5.
I am still use broadcomm stack, not only works fine with bt620s, but also better with my gps receiver.
http://rapidshare.com/files/37382412/broadcomm_bt_stack.CAB.html

Thanks alot!
Ahem... On WM5 and shipped BT Broadcomm stack it still has bad connection!

Tweaking Bluetooth Stereo settings?

Wololo,
I tried pairing up my Sony DS-980 stereo bluetooth headset with my Touch Pro 2. That worked flawlessly. I find the new bluetooth interface to be quite good. It has lots of fancy settings in a nice GUI.
BUT
When listening to music, the sound through my headset isn't very good. It sounds compressed and.. mediocre. I know it's not the headset, as it worked fine on my HTC P4350 (after some tweaking in the bitpool, that is).
I used to use Advanced Config for tweaking the bluetooth stereo settings. Apparently our Pro2 uses a new bluetooth stack which is not (yet) configurable through that program. I then tried searching for ways to edit the equivalent of the bitpool for our tp2's widcomm bluetooth stack. An old thread on xda stated 'Line Speed' to be the new 'bitpool' name. But that string is not in my registry. I might try adding it, but I doubt if that will work.
I also found 'Baudrate' as a candidate. but it's set to 4.000.000. That's quite high, in my idea.
Before I mess up my registry with 'playing around', does anyone know what else I can try? And am I the only one experiencing poor sound quality through stereo bluetooth?
Thanks!

Hi,
BT Stack on Rhodium is from Widcomm.
You can find the config in
HKLM\Software\Widcomm
I have not dug through to find ASDP settings, no time at the moment.
Please post back if you find it or not so that I can add them to the tweaks sticky.
Not sure if you have tried this or not, but with my car kit (which support HFP, A2DP and AVRCP I have to activate Stereo Audio on the Rhodium in BT Config, perhaps your headset behaves the same. If I do not audio is ****.
Cheers,
Beasty

OK, I think I got it. The Linespeed value does indeed seem to have an effect. I used this wiki as a guide:
http://wiki.xda-developers.com/inde...h your stereo Bluetooth headphones? Read this!
I used Resco Explorer Registry add-in to add the following DWORD value:
HKLM\Software\WIDCOMM\Plugin\AV\LineSpeed with a value of 320
That seems to do the trick. I'll test it for a bit, but I'm not experiencing drop-outs as of yet and my music sounds much better.
PS I first tried hacking around in the HKLM\Software\WIDCOMM\BTConfig\SerialTransport; increasing baudrate/bytesize values. Don't. Changing stuff breaks the bluetooth

yesterday i tested the a2dp range and it auto reduced quality the further i went. Unfortunately it did not vice-versa.
I'm going to test that reg.
EDIT: Definitely that reg works but it also makes the cpu use heavier and you notice that while using gps software on the car and streaming music. The 528mhz cpu is not powerful enough for this task. After some testing the value is like kb/s, so 272 is the usual for good quality, above that it takes allot of cpu. At the end i removed the reg because the device does the auto quality/cpu usage quite well. The quality is not quite the same has with a fixed value of 272 but barely worst.

Yeah, I noticed the same thing with the distance and quality, which kind of sucks as over time if the signal weakens for what ever reason (which will likely happen over an extended period of time) the audio quality gets worse and worse over time.
Also I have noticed that Audio controls don't seem to work on the TP2 with my BT stereo headphones (Sony DR-BT21G) and seem to play at max volume all the time. Not sure if this is something you guys have noticed as well or if it is specific to my head phones, though they have worked fine with other devices.

if you google it you will find ppl with dell and hp pda that uses/installed widcomm/broadcom stack and "unfortunately" it's a feature. The volume is controlled only by the a2dp receiver.
The linespeed does work but try and use wifi and a2dp at the same time You will get so much skipping :S My best experience is without that reg. Not the best quality but.. You will live with it.
Also it does adjust the "quality" itself. Lowers and uppers. It's just not instant.

anyone figure out the reg settings so it will force the call to use ringtone?

Bluetooth A2DP and BitPool Settings: Configurable?

I think you used to be able to set the BitPoo settings in the registry in the old MS Bluetooth stack on the Tilt. On the Tilt 2, it doesn't seem to be an option in the HKLM/Software/WIDCOMM/Plugin/AV registry settings.
An interesting twist: I just bought SKTools for $16.99. The product was just updated for Windows Mobile 6.5.
Long story short: under the Optimize options in SKTools for Bluetooth, you can set three BitPool values. The settings seem to do some good if they're around 58 (max, min, and the third setting).
The BitPool values seem to work in conjunction with the LineSpeed setting which has been discussed in the xda threads. There's probably a sweet spot that needs to be reached.
PS: I can't confirm where and what SKTools does to the registry when BitPool values are changed, but it does seem to at least have a placebo effect on this horrible Bluetooth implementation they've inflicted with the Rhodium.

HD Tweak allows you to change the Bitpool, Use the search box, it works wonders...

I don't share many people's opinion of the widcomm bt stack but it might be because none of my myriads of bluetooth devices have issues (bmw handsfree, jawbone 2 headset, nokia hs12W stereo/headset, motorola dc800, garmin gps10, i-go bt keyboard).
For A2DP (which is where most of the complaints originate), the only m$ equivalent adjustable registry value for this stack is LineSpeed in HKLM\SOFTWARE\WIDCOMM\Plugin\AV. This is pretty much like the bitrate value in the M$ bt stack and affects audio quality pretty dramatically. Conversely, it also affects skipping. The higher the value, the better the quality but the more likely it is to get skipping. I've got mine set to 320 and neither my DC800 nor my nokia headset are having skipping issues. I know my Nokia headset buffers the stream to minimize this however. Not sure about the DC800.