I'd just like to draw your attention to a fairly comprehensive video series on granular synthesis, GUI design, OSC messaging and app development I am in the middle of creating right now. I hesitate to call it a tutorial explicitly, as the presentation is somewhat informal and improvised, thereby including the occasional, erm, technical hitch, but it's all good. If you would like to patch-along, learn and even comment/criticise, join the party. So far there are 3 videos, totalling around 2hrs, with a further 3 videos (on MobMuPlat, OSC and app packaging) in the pipeline. I'll be posting all the patches and code both here and eventually on GitHub.