I have the same Problem with QU24 and Recording 24 Channels via USB B in Samplitude Pro X, Windows 7 / Intel i5
The distortion is recorded over all Tracks, The Firmware Version QU-24 is 1.71, Samplingrate 48k, QU-ASIO Driver for Windows
PFL Signal is clean, ist only in the Record Stream,
thanks for a solution
chris