Thank you for Genny! It really is my favourite 4-op FM synth and has a great interface. However, there is a detail that makes editing sounds a bit difficult sometimes: I've found no way to individually mute and unmute operators. Is there a way to do it? If there isn't, it would be a really good addition to a future update.
Also, it'd be great if in a future update you could directly input values for each parameter using the keyboard. The knobs are a bit finicky sometimes, but this is just a minor gripe.