I just set up Studio 192 for the first time. I have a mic in one channel for testing, the mic sounds good through headphones and monitor speakers. I tried recording the mic on one track in Capture and also in Pro Tools and the on playback from either system it is horribly distorted.
I have a mac book pro running OS X El Capitan. I have updated the Studio 192 firmware after launching UC Surface and have the latest version of UC Surface.
I am recording 48KHz, 24bit