i've tried both TS and TRS feeding the input of the 7600 from the toft board and i can barely hear the effect.. even with the sends and returns pegged to the top.

but, because i hear the effect fine when i plug directly into the 7600 or through a little mackie mixer i have…. i think the problem is the toft…

but it still doesn't explain the meters not moving on the 7600 or the massive noise floor