I posted a similar topic in the Rectifier subforum, hoping someone could answer this. As you know the Express series has a three button foot switch (channel, reverb, contour). I recently added a Rect O Verb (series two) to my lineup. It also uses a three button foot switch, with the same type of cable and housing and lay out as the Express', with exception of the third switch (contour on the Express, solo on the ROV). There is an issue with switch the ROV came with and I'm wondering if I can just use the Express foot switch until I get the other repaired.