today i've tried for the first time to use eventide with my new custom audio mono head.
Since i don't have a line mixer to put in practice your triks, i've just tried to connect one of two output to head's return. The results it's a terrible boo (whistle), a variable ground noise in relation to what algorithm i'm gonna use.
A month ago, i'm going to a friend owner of a head like mine, to try eventide's sound, and what i've just described it happens again, even if i use another cable.
Since i've a y cable at home, i've tried to connect both output with the return, but ground noise was much louder.
When i used eventide with a stereo pre and a stereo final, everything goes right: never heard ground noise.
What can i do?