Thanks - dabuplayer, that makes sense because I have played music to my mono Motorola HS850 BT headset from two of my Dell Pocket PC's in the past, and also from my desktop computer with a USB Bluetooth dongle installed. Odd that Kagu / N800 / Mplayer refuses to work that way. I have reflashed my N800 (wiping everything back to Nokia factory all) and performed all the Milhouse instructed steps again. Each time I did the Milhouse steps with great care ( I am an assembly language programmer with 30 years experience so I know how to not screw up something as simple as this). Still no sound coming thru my HS850. I believe others who claim Milhouse's trick is working for them...... oh well, I hope that IT OS2008 will have A2DP next month, and that it will allow me to use my HS850 with Skype too......that is something that is very desirable. One of the main reasons for my buying the N800 last week was to use it with Skype, GoogleTALK, and Gizmo Project VOIPs. Shame that the multimedia and VOIP Bluetooth stuff slipped by those at Nokia. They obviously were concentrating on Bluetooth GPS, cellular Internet tethering via bluetooth and Bluetooth keyboards way more than WiFi / Bluetooth Voip use. I'm not complaining.... Kagu is fantastic and so is Skype on the N800. I'll flash the OS2008 when it posts at maemo and enjoy 400mhz cpu speed hopefully next month.