Agreed that you can do much more than "trivial toys" with the current WAAPI! But you can only do a small part of FM without feedback (unless you're just talking

Agreed that you can do much more than "trivial toys" with the current WAAPI! But you can only do a small part of FM without feedback (unless you're just talking about vibrato as opposed to canonical FM synthesis). Look at the modulation paths (aka algorithms) of original Yamaha FM synths...