Hi Will and Jerry, Three notes: 1. Bone conduction does not give you stereo let alone spatial sound, just mono, so sound localization is miserable. 2. HRTF maps do not work well unless they are individualized. That's why DirectSound3D does not work particularly well for most people. 3. 3D sound tends to break down when there are more than a few items sounding. In a visual view there are typically many items. Best regards, Peter Meijer Seeing with Sound - The vOICe http://www.seeingwithsound.com http://www.visualprosthesis.com