May b its PortAudio`s fault, but why on 1 comp line 6 amplifi works fine with bitwig, and UX2 does`t work? And don`t forget about fact, that after apgrade to win10 there was`t sound at all from ux2, only when someone found 16bit48kHz setings bring it alive... so maybe portaudio programming is poor, but programming of ux2 drivers for windows are`nt greate too.