I have a AudioVox Maestro which is identical to the Toshiba e570. I have a Billionton Compact Flash Bluetooth. I have a WNI bluetooth Headset. I would like to listen to mono(ebooks) mp3 and other audio through the headset. I don't need stereo quality. I also don't need to send microphone sound to the pda. I have tried to re-rip the mp3 files to mono. I am able to dial my bluetooth cellphone from the pda/bluetooth Compact Flash card. I have tried the registry hack but only hear muffled noises through the headset. OS = Windows PPC2002. Widcomm's bluetooth manager works great with my bluetooth cellphone and it IDs the headset. Is there a bluetooth manager utility that will help with this? Or something else?? I just want to find a way to make it work.