Pan control on Fluidsynth doesn’t work.
I have a Fluidsynth piano on channel 1 and a Linux Sampler drum on channel 10. Linux sampler audio output out is left but Fluidsynth out is on left and right. It’s annoying as I want them to be separated.
I tried some of the available effects to see if a panning option was available but no chance.
I can confirm that the gm yamaha piano doesn’t pan (not entirely sure the reverb does anything either) .
But my separately loaded Mellotron sfx files can and do pan, so it looks like it’s a sample characteristic.
Depending on how intrigued one is, one could pull the files out of the zynth and see if they behave on the PolyPhone
Is how I loaded them in (they were sf2 files not sfx)
Can’t remember where I bought them but it’s got great stuff like the bosanova tapes for ballroom operations !