just reviving this old thread because i never solved the problem.
even if i'm sending a signal into the 7600 that's blowing my ears off i only ever get a maximum of one input LED lighting up and sometimes 2 output LEDs…
this is with a synth plugged directly into the 7600… not using the aux loop in my toft mixer at all (when i use that i get a massive -30db noise floor from the 7600.. that's another problem altogether)
this 7600 has been so weird… with levels.. that i hardly ever turn to it to use.. which is a shame. maybe i should send it to eventide so i can find out if the problem is with the unit or something on my end.