This may be a subject for another thread, but when I recorded output 1-2 to 3-4, I noticed the waveforms were not the same. Though it was easy enough to compare the two's timing, one wave form is somewhat different than the other. Is this "coloration" from how the interface samples, do more expensive interfaces have less coloration of the waveform, has anyone else noticed this. It seems if both source and sink were set to unity gain, the waveforms ought to look the same, no?