RNBO FM patch export to Web results in a different sounding synth

Hi there. Would you mind copying the patcher content compressed? (Select all the objects and then select copy compressed from the edit menu).

This way it’s easier to reproduce without having to duplicate the patch from your screenshot.

thanks

One debugging step would be to check the values of all of the parameters using for exampleconsole.log(device.parametersById.get("harm").value);
for each of your parameters, just to check that they are all set correctly.

Hi Florian and Andrew.

Thanks for you responses.

Andrew I'll try out your debug

Florian - alas, I'm just trying out RNBO and haven't bought a license yet. So, it doesn't let me copy the code. If I do, I'll paste it here...

Cephas.

Is the synth polyphonic? Maybe there is a param that is not initialized correctly in some voices?

Hi Ben,

It is polyphonic yes. I've rebuild it as simple as possible to illustrate the issue - sorry I can't export more easily:

Harm at 1, modi at 2 sounds concordant.

But when exported to web, same values sound completely different - unharmonious, despite the modulator being at the same frequency as the carrier!

Thanks all.

One thing I notice is that you have an [out~ 0] (which I am surprised compiles). Does it change anything if you use [out~ 1] and [out~ 2] instead?

Hi Ben,

Changed and exported. Still the same issue. I wonder if the harm and modi inputs in JS are getting scaled somehow?

Even simpler - have removed any parameter inputs and just left the internal calculation:

import { createDevice, MIDIEvent } from '@rnbo/js'

let device;
let WAContext = window.AudioContext || window.webkitAudioContext;
let context = new WAContext();

window.addEventListener('click', () => context.resume() );

function playNote(pitch) {
    let midiChannel = 0;

    let noteOnMessage = [ 144 + midiChannel, pitch, 100];

    let noteOffMessage = [ 128 + midiChannel, pitch, 0 ];

    let midiPort = 0;
    let noteDurationMs = 250;

    let noteOnEvent = new MIDIEvent(context.currentTime, midiPort, noteOnMessage);
    let noteOffEvent = new MIDIEvent(context.currentTime * 1000 + noteDurationMs, midiPort, noteOffMessage);

    device.scheduleEvent(noteOnEvent);
    device.scheduleEvent(noteOffEvent);
}

const fmSimple = async () => {
    const rawPatcher = await fetch("/json/fm-simple.export.json");
    const patcher = await rawPatcher.json();
    device = await createDevice({ context, patcher });
    device.node.connect(context.destination);
};

fmSimple()

window.addEventListener('click', () => {
    playNote(48)
});

It's as if the math being applied to the signal is incorrect.

Many thanks!

Would it help to change mtof to mtof~?