maybe you’re overdriving the overall output of the OT?
or maybe you recorded the samples too loud (ie. already clipped).
but frankly you should check the entire signal path, because the OT offers independent volume changes on multiple stages. so, you should definitely check:
- output level on ext device
- sample volume gain (on the last page in the editor)
- the volume level on the amp page
- track level
- overall ouput level