Some issues with audio levels when sending to different midi channels

[muziker]

So i did this:
load /usr/share/sounds/sf2/FluidR3_GM.sf2
gain 3
for all channels:
setbasicchannels channelnumber 3 1
pitch_bend_range chn 255
select chn 1 0 0

I do this to be able to generate pitch bends to individual channels using pure data.

When i play notes targetted towards odd numbered channels, the sound is soft, but on even numbered channels the audio seems to have the gain applied. Is there something about how fluidsynth is set that causes this to happen? Is this a bug? I've tried it with mode 0 as well.