I also have to use the lower BT sound quality settings. The problem is that when the MK6000 mutes the radio, it takes a finite amount of time for the CarPC sound to come out of the cars speakers. As a result the initial part of the iGuidance command may get clipped. This only happend when using the high quality BT sound settings. For some reason the low quality BT sound settings don't take as long and the commands are rarely clipped. I wanted to remedy this by inserting a "ding" wave file before an iGuidance command is spoken, but this did not work. I am still using iGuidance 2.X though. I know IG 4.0, which just came out recently, uses a different setup for the voice so maybe there some room to play there. The high quality audio definitely sounds better, but the low quality is good enough for navigation commands.