I have discovered a problem when I record with Toneport and Gearbox. I get weird overtones/harmonics when I use Gearbox. It's more noticeable on certain notes and with low gain.

The interesting part is that if I use my Marshall line out feature into the Toneport, there is no hum. So, it seems the Gearbox software isn't liking the Toneport for some reason.

Has anyone else noticed this?