It might be due to analog clipping/overload in the stages before digitization or in the A to D chip. You may not be able to see clipping from that stage in the digital waveform view, since the digital wave is not being clipped.

If there is a mic PAD on the unit, try turning that down.

If no Pad control, try moving the mics further back from the sound source and see if it clears up.

If the mics on the unit have plugs to connect, the plugs could need some cleaning due to oxidation at the connection points. Deoxit or equivalent on a pad and wipe the plugs with it, insert immediately a few times to get the good goo inside the jack as well.


--Mac