Rumbletone
Inspired
Connected directly to the amp? It's pretty much silent.
On Channel 2 it's around 59 dbs at gig level.
With 4CM and FM3 at the same level is around 80dbs (with the Morley Humno went from around 80 dbs to around 73/74 dbs)
(these measurments are done with the guitar volume roled off.)
To be clear, I’m asking about when the FM3 is still connected in the amp’s FX loop, but instead of the guitar going into the FM3 and then sent to the amp input, you just unplug the guitar from the FM3 and plug it straight into the input of the amp. I’d also suggest trying just unplugging the input to the amp entirely and see whether that eliminates the noise (if not, then the noise is originating at or after the amp’s preamp).
I’m trying to isolate whether the noise is originating from before or after the amp’s preamp (in order to suggest what might be adjusted to reduce the noise).