VeriFone MX800 Series - Soundctrl()

DEVICE DRIVERS
soundCtrl()
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800 SERIES PROGRAMMERS GUIDE 133
soundCtrl()
The VeriFone supplied library (libvfisvc.so) contains support for controlling
the audio volume, bass, and treble via the following API:
Prototype
int soundCtrl(int volume, int bass, int treble)
Parameters
Return Values
volume Accepted values: 0-100
bass Accepted values: 50-100
treble Accepted values: 50-100
0 No error
Less than 0 Error occurred
0 Sound off
100 Maximum volume