[thewebcount]

Regarding aftertouch, it does support it in a way (and it's shown in the video). For many synths, after you press a key on the on-screen keyboard, if you hold it and move your finger up towards the back end of the key, it gets translated into aftertouch. GarageBand on iPad has supported this as long as I've been using it (a few years). I don't know if every synth supports it, but there are definitely some who do.