Derailer

An extremely valuable addition to a sound designer's toolkit, or any fan of PM synthesis. For that matter, an excellent proof of concept or educational instrument for a newcomer to PM synthesis. That goes for any of Physical Audio's instruments.

Actually... For a good 100,200,300 level PM synth from this manufacturer, I would start here with Derailer. Then move to Preparation, and finally to Modus. They advance in sophistication, or complexity, in my opinion. There are certainly other PM synth developers that make things somewhat more accessible, but I don't think they necessarily show you what's going on under the hood as well, in general.

Nor am I claiming that other PM synths aren't amazing and must-haves, I have a solid list I certainly wouldn't do without.

I'm sure others have plenty of valid opinions on this topic.

Anyway. Check this out.

(I'm not employed by them or endorsed or whatever, I just love their products).