Slight Distortion

[dotonemanband]

I use Cakewalk by bandlab to put together midifiles. I'll finish a midifile and it sounds fine. Then I usually tweak the volume using Wavepad Sound editor so I can keep the volumes consistent with other midifiles. Then I transfer file to Bandhelper. I'm finding that some of the files (not all) have some distortion. Any suggestion on why that is?

[arlo]

Do you hear the distortion when you play the file in the Wavepad Sound Editor, or only when playing in BandHelper?

If you turn down the volume on the recording edit page in BandHelper, does the distortion go away?