Yes, that was the main feedback I got after releasing it and since version 1.1 there is a modulation section where any parameter can be modulated with envelopes

Yes, that was the main feedback I got after releasing it and since version 1.1 there is a modulation section where any parameter can be modulated with envelopes and LFOs, including what sound is played. I never got around to making a video about it, though.