Most prefer to go direct as do I as it is the better option vs. mic’ing an FRFR. However, if you’re using a power amp and regular guitar speaker and cab, then a mic may be a better choice.
It's the same signal either way. But if you use the out from the FM9 to the mixer you have more control over the level, independent of the signal level you're sending the speakers.
Depends on the venue. Can FOH handle stereo? Does whoever is at the board know how to mix stereo? Does it improve the FOH sound or make it worse?
Stereo if you have a stereo PA setup.
Miking an FRFR isn't recommended. You can't easily or conveniently close-mic it unless it's a coaxial, and even then its balance is going to be off.
For recording I'd capture stereo. You can always fold it to monaural later, or pan both tracks the same amount, but splitting a monaural signal to stereo won't work well.
it has a Left and Right main output. yes. channels can be panned. channels and monitor outputs can be linked to create stereo pairs.
i don't have a 25x30 metal barn, you might have to be the one that tells us.
Out 2 (and 3) make no signal by default. Turn on Copy Out 1 in the Setup > I/O > Audio menu for out 2 and turn the physical out 2 volume knob up.
