Thanks, I ended up loading the cartridge on https://www.webaudiomodules.org/wamsynths/webdx7/ https://www.webaudiomodules.org/wamsynths/webdx7/, it works great

Thanks, I ended up loading the cartridge on https://www.webaudiomodules.org/wamsynths/webdx7/ https://www.webaudiomodules.org/wamsynths/webdx7/, it works great in Firefox (no crackles).