My PreSonus BlueMax is generating a slightly distorted output signal. It's occurring on any setting, including the manual adjustment setting, and regardless of the position of the pre- and post-gain knobs. When I defeat the compression effect with the "Process" button, the distortion disappears. It is especially noticeable in lower registers. I'm not talking Big Muff Pi distortion here, but it's enough to affect the quality of the sound, to keep me from ever recording with it, and to compromise the super-clean tone I've spent so much time and money on otherwise. Anyone have a similar experience?