Bug? FM3 Crackling/buzzing in loop

[MM-Chris]

I have my FM3 in the loop of a Soldano SLO-30, and it's giving me a weird crackle that I can't seem to get rid of. Any insight would be awesome.

• Cabled up in "FX PROCESSOR ONLY (“POST”)" mode, per the user manual
• Input 2 mode is set to Left Only
• Input 2 padding set to 0, but adjusting it makes no difference w/crackle
• Out 2 knob fully clockwise, but adjusting it makes no difference again
• Latest firmware
• I've done a factory reset
• Blank preset with no effects (all shunts) to rule out it being CPU related
• Output block is not clipping

Here's a video of the amp without the FM3 in the loop. To rule out it being the amp itself, I put a plain old MXR reverb in the loop here. No crackle at all, and I'm using the same cables that I use for the FM3:




And here's a video of the crackling noise with the FM3 in the loop. Same cables, no effects, just a blank preset with nothing but an input and output block.




Any insight on getting this sorted would really be appreciated. Thanks!

Edit: Whoops, this probably shouldn't be in the bug forum. My bad.

 

[Admin M@]

Chris, is USB connected? If so, let's try it with that disconnected.
Also, are you using Humbuster cables?

 

[MM-Chris]

Thanks for the reply!

- USB makes no difference (it was connected in that vid). Crackle persists without it.

- I'm not using humbuster cables. The cables are good though, and if I swap in an Axe-Fx or my kemper the crackle goes away, it's just with the FM3.

 

[yek]

Tried running the FM as a pedalboard, with IN 1 and OUT 1 (at -10 dB), at unity gain? Just to compare and check for crackle?