themaister / libfmsynth Goto Github PK

Hello!

Nice work on producing an FM synth.

I'm having a bit of trouble getting good results when using particular arrangements of operators/modulators. For example, there's a really recognizable characteristic sound that FM synths tend to make when you modulate 1 ← 2 ← 3. That is, 1 is the carrier, 2 modulates 1 and 3 modulates 2. I'm using the Hexter synth as a reference here because it seems to be the only other working open source FM synth, but it applies to just about every hardware and software synth I've ever used. Apologies for the zip files, but GitHub won't allow me to upload Ogg Vorbis audio:

hexter.zip

The three notes you can hear are:

1. The carrier 1 without modulation.
2. The carrier 1 being modulated by operator 2.
3. The carrier 1 being modulated by 2 which is in turn being modulated by 3.

Here's the exact same modulation setup in libfmsynth:

fmsynth.zip

It sounds pretty awful. Nothing like what I'd expect! Here's the preset, for reference:

snarl.zip

Am I doing something wrong? Is there some way to get libfmsynth to sound like the output of Hexter?

Unfortunately, the only sound that I am able to produce with the LV2 plugin of libfmsynth is a very quiet, low-pitched "hummm" if I send MIDI notes to it.

I have created the LV2 on a recent Arch Linux / x86_64 according to your documentation. The plugin loads fine in jalv.gtkmm. I am able to load one of the provided presets and can see corresponding value changes in the plugin's GUI. MIDI notes are send using jack-keyboard, and the required jack connections are created using Catia. The same setup produces audible sounds using for example TAL-Noisemaker LV2. I can reproduce the same behaviour using Carla as a host.

Apart from that I have created the test program. If I run the program providing a file name it creates this text file containing two columns of numbers.

Do you have any idea what might went wrong?

Hi Themaister,
found your library. Is there an example to create realtime Sounds under Windows with SDL, aolib or winmm?
Thx - greetings kmatze

Thanks for this hidden gem, great work!
I have a coupe of feature requests, but I'm not sure if you are still interested in working on this.

Hi @Themaister , thank you for making such a great library!
Just wanted to let you know I created a simple Dart FFI based wrapper package for it to allow it to be used in Dart and Flutter apps.