M-400 - I ripped some CD songs to WAV and put them on a USB stick or USB key. When I play them on the M-400, they cause the clip indicators to light up. They're not distorted or loud. But the clip indication bothers me.
Most music CD's are heavily compressed and peak at digital 0dB. Because we are porting the USB stick directly into a channel, we can attenuate it (if it's really too loud) but we can't adjust the incoming gain. Your CD music should sound fine; it's merely tripping the clip indicators. To solve this, you can edit your WAV file in an audio editing program and drop its gain a few dB. This will stop the clip indicators without harming the sound quality of your files.