BitPerfect

Having played with Rpi3 for month with pure MPD, now I am using pCP.

I would like to know what kind of setting I need to set in order to achieve BitPerfect playback.
Let me say, avoid resampling, avoid software volume control, etc.

In particular, my external USB DAC is capable of hardware volume control, but I am not sure how to use DAC volume control and not something "software" (decimation by Rpi3, etc.)

Thanks a lot.