- OpenSLES Callback now performs simple mix of 2 sources (speaker and mockingboard)
- Avoids multiple callbacks which was a performance penalty especially for low-end droids
- This appears to work on a wide grange of older Gingerbread through to the latest Nexus class devices
- TODO : we really should write a dynamic calculation/adjustment routine to determine the best working buffer for
any device this code runs on =)
- Uses buffer values gleaned from Android system
- Removes completely unnecessary playq and uses ringBuffer instead with read/write heads
- ringBuffer includes a certain amount of "overflow" space for callback convenience
