My footswitches changed job
A different layout
Working as designedLayouts reassign all three switches at once. The FM3 boots into Presets; holding the left or right switch moves through banks.
FM3 Owner's ManualReference
Reference
Troubleshooting
Indexed by what you notice, not by what the subsystem is called — because when something is wrong you know there's no sound, not that it's a routing problem.
6 of the 8 problems below are not faults. They are documented behaviour that looks like one, and they are marked working as designed.
It won't let me add a second amp
The FM3 allows one amp and cab pair
Working as designedFractal state this directly. Use channels inside the one Amp block to get four voicings instead — that is the FM3 way.
FM3 Owner's ManualMy aux input stopped working
Input 2 is wired as an FX return
Working as designedIt is one jack pair doing two jobs. Wired as a loop return, it is not an aux input.
FM3 Owner's ManualThere's no quarter-inch on Output 1
Output 1 is XLR only on the FM3
Working as designedUse Output 2's quarter-inch pair for an amp, or an XLR-to-TS cable from Output 1.
FM3 Owner's ManualThere's hum going into my amp
A ground loop
Use a Humbuster cable from Output 2. On Output 1, use the ground lift switch.
FM3 Owner's ManualThere's a gap when I change sounds
Presets where scenes would do
Working as designedScenes load nothing and switch seamlessly. Build song sections as scenes.
FM3 Owner's ManualIt won't let me add a block
The preset is out of CPU
Replace duplicate blocks with channels. On an FM3 this is not an optimisation, it is the technique.
FM3 Owner's ManualI lost my changes
The preset was never stored
Working as designedPress STORE. Changing preset with the edited indicator lit discards everything without a prompt.
FM3 Owner's Manual