Using the EVAL-ADAU1761Z, I tried 1761's basic DSP function and turns out that the output is distorted.
INPUT : single ended stereo at LAUX and RAUX (but used only RAUX in DSP program input)
OUTPUT : right differential output
If DSP is bypassed, that is signal routed directly to playback through RAUX, output seems ok. This is bypassing the ADC, so to speak. Tried to setup the ADC/DAC setting to inverted polarity, but didn't help out. Did I miss something? Attached is the simple DSP program with DSP not bypassed.