Simple Zig Synthesizer (WebAssembly)

Playback hz
Length in seconds (whole number). Can't be that high.
Round robin note indexes
comma separated 8 bit note indexes, can be between 0 and 103
Round robin wave indexes
comma separated 8 bit note indexes, can be between 0 and 15
Round robin note volumes
comma separated 3 bit volumes, can be between 0 and 7
Note length in samples (whole number).

You can, press the button multiple times in quick succession to have the waveforms interfere.
This may be loud, it's driving the speakers at maximum amplitude. I would advise against playing this with headphones on at high volume or in high volume on systems where this would pose an issue.