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USB Audio volume taper

Question asked by name.first on Nov 24, 2013

I have implemented a USB microphone which uses OS default driver. I define the volume from 0x0C00 (MAX) to 0xE000 (MIN) correspond to +6dB...-24dB.

Control in Windows,Linux works. However taper is the wrong way: Step-resolution is very high when volume is low, and is very small when volume is high. Should be reverse. Both OS ignore RES(olution) value send from USB device.

How to get taper the other waY? I try to play with different MIN...MAX values but always same result.

thank you