Are you absolutely sure about that?
What’s in-between RPi and Motu?
I’ve unfortunately not got any improvements to offer, just an observation, which I’d be thankful to get a comment on from @support.
I’ve extensively used two DACs, and intermittently two others on loan, throughout the past ~2 1/2 years and regardless of SW/FW version, interconnections and setup there’s always been more or less strong tics and pops when starting/stopping, ffwd/skipping, or using DSP volume during playback.
My assumption is, that there’s no algorithm implemented in RAAT looking for signal zero-crossing occurrence to then perform the respective command.
Instead, any such command is instantly executed.
Waiting a couple of microseconds at the max for a zero-crossing to occur would eliminate these more or less severe instant sample to sample signal jumps.