Cracking Sound

Hi!

I'm trying to get bluetooth audio working on a PowerPC machine, but it 
has some strange effects.
I'm using a bluetooth headset (HSP profile) via ALSA but it seems that 
it has some problem with various sample rates and other data related 
stuff.
The asound.conf contains the appropriate device address, profiles is 
set to voice, device is named as 'btheadset' (the 
share/alsa/bluetooth.conf is also included).

In BlueZ's output it seems that is is playing (statu is 
PLAY_IN_PROGRESS or PLAYING - I don't remember correctly) the stream.
When BlueZ is connecting to the device I hear a beep in the headset but 
the "stream" is only a cracking, clicking and poping noise, nothing from 
the original sound.
Also this sound comes if I force aplay to 4KHz or 8KHz, in other 
settings or without forcing, it plays nothing (no sound, only beeps).

Do somebody know which problem can cause this side effect?

I' using ALSA 1.0.24 and BlueZ 4.96 (both are untouched, no patches and 
no config file modifications - except that I had to create an 
asound.conf).

Is anything else I can provide about the problem?

Thanks for the help!

BR,
Krisztian