How do I access a certain API function using the CLI version?

[DaforLynx]

Hi, for reasons, I need to use this API setting to change the interpolation method of FluidSynth's sampling (I'm assuming it changes the interpolation of each voice rather than the overall output). Is there any way I can do this? The closest I can find is using -o audio.oboe.sample-rate-conversion-quality but of course I'm not using Oboe and it probably doesn't do what I want it to do anyway.

[DaforLynx]

Update: after much trial and error I managed to compile it using the desired interp method
Would still be nice to be able to access it in the CLI

[derselbst]

Fluidsynth's shell provides the commands interp and interpc for this purpose, see help general. Put these commands in a text file and pass it to fluidsynth using the -f option, see UserManual.

[mawe42]

Which version of FluidSynth are you using to test this?

[mawe42]

And how are you testing the effect of the interp command? Playing a MIDI file?

[DaforLynx]

I am using 2.3.3 as stated previously. I've also confirmed it using a self-compiled latest version.

[DaforLynx]

Yes. I play a MIDI file using an sf2 and use the option -f "path\to\txt", with said txt only containing interp 0.

[mawe42]

Please check if your MIDI files contains a system reset message (which would also reset any interpolation settings previously set via the config file). Using -v on the command line will output all midi messages to the console.

[DaforLynx]

That appears to be the case.

Since it doesn't appear there's any way I can change this via my preferred MIDI editor, I guess I'll just stick to using my self-compiled version. Is there a way I could justify suggesting the interp settings not change on a system reset message?

[mawe42]

The MIDI Spec says the following about system reset messages: "Reset all receivers in the system to power-up status. This should be used sparingly, preferably under manual control. In particular, it should not be sent on power-up."

So I in my opinion, FluidSynths behaviour is correct here: changing the interpolation method is a run-time setting that gets reset to power-up status on system reset. And to be honest, I think it's quite unusual for a MIDI file to contain a system reset.

[DaforLynx]

Alright, that's that, then. It's a result of a translation process (I'm using VGMTrans to rip some MIDIs, and...well, it's irrelevant) and I just can't seem to find a way to get rid of those messages. It's alright, though. Thanks for the help in diagnosis. And I'll mark derslbt's original comment as the answer.