high pitch sound from T1
I am running a Zoom G3n into a T1 and on to a Compact. Sounds find. If I put anything in front of the G3n--another G3n, an EQ, etc--there is a high pitched done that comes through. This does not happen if I go from the G3n directly to the Compact. It is not an ear-splitting sound--but definitely audible to an audience. The music coming through the Compact sounds fine (other than that tone).
I am using unbalanced patch cables (I have tried several--and I have never used anything but unbalanced cables). I have by-passed ToneMatch, eq, effects, etc., on the T1 changed power outlets (used a Furman) all with no change. Again, if I bypass the T1, it is fine.
Can't help but think I am missing something.