I have a normal TS7, its the $50 version. I've modded it to the ts-808 stats. BUt the problem is, and it happened before the mod also. When i would switch the setting from "ts9" to "hot". I get horrible feedback, no matter on what volume either the pedal or amp is on. So uh, any suggestions on whats wrong. As of now it's just a simple Guitar-ts7-amp.
Custom Fender Strat
Oscar Schmidt Acoustic
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Modded Tubescreamer TS7 -> TS-808
Strat Knockoff