[fluid-dev] RPi "graininess"

[Ben Gonzales]

Hi all.

I want to play my recently-purchased WARBL wind controller at my local 
recorder music group, and I am using a RPi 3 with a HiFiBerryDAC+ sound 
card with FluidSynth 2.1.6 compiled from source.

I am getting a "graininess" in the output at low volume. It sounds a bit 
like a loose connection on the speaker (but it isn't that). What happens 
is when a play a steady long note at CC2 of, say, 30 I hear step changes 
in the volume. OK, I can't hold perfectly constant pressure, but I don't 
hear the same things on other synths. It happens with different 
soundfonts (so it's not the soundfont), and it happens with different 
wind controllers (not just the WARBL). It doesn't happen at higher CC2s 
above, say, 60.

I have tried putting a smoothing function into the incoming CC2s, and 
that helps, but I don't like doing that.

Are there any settings that I should be adjusting?

Ben