Sat Nav [CoPilot and Navigator tested]
Music app [PowerAMP and HTC Music tested]
Audio cable [3.5mm audio jack - plugged into car stereo]
Sound settings all full [set in Quick Settings and also manually set Navigation Volume when Google Navigator is running]
Audio is fine when any music app playing [with or without cable]
Audio is fine when any Sat Nav voice playing [with or without cable]
Audio is fine when any Sat Nav + any Music app both playing (music cuts out and voice becomes audible) [WITHOUT CABLE]
--- Sat Nav voices becomes too low to hear when both Sat Nav and Music playing with cable plugged in ---
This was working perfectly fine on stock HTC (both Froyo and GB) with kernel Buzz OCUV 1.0.6.
I have only seen this issue since flashing Android Revolution HD 5.1.9 > 5.1.10 > 5.1.11 . I have tried different kernels ( Stock ARHD > UnityV2 > UnityV3 ) and also retried Buzz OCUV 1.0.6 but the issue still remains.
Does anybody have any ideas as to what could be the problem?