So here's the topo: I had a Line 6 M13 I loved very much in front of my amp when I thought I'd give it a go in the effects loop. I wasn't able to get enough volume from the fx loop so I just put it back in front of the amp until I eventually sold it.
Then I got a Source Audio Collider that I really wanted to run in the effects loop. Providing it has output level control (contrary to the M13) I thought volume output would be no biggie. That did not go this way.
Every time I tried to mix in a little effect it started (trying to find the right words here) rolling over itself until window-breaking feedback, even with the amp running at 1w. Also everytime I plugged in the Collider, overall amp volume dropped down by almost 25%.
Then I got some buffers, put one before and one after the Collider, even though it has a Buffered Bypass mode. Signal is now very strong coming in the effects loop.
Finally, I stumbled upon this thread: viewtopic.php?t=31979
Thinking a simple boost would fix my problem I got a TC Spark Mini for cheap. Then this happens now.
https://imgur.com/a/9RwG8E8
I've tried different cables, different power supplies, different ac outlet, different everything.
Please help.
