I downloaded the app about a week ago, very addicting. The synth is pretty deep with all kinds of settings. The modulated expression is a amazing. The
app easy to get lost in (in a good way) creating scales and surface settings etc. I'm already at 150 presets, The playability is very fluid, works
great with a midi keyboard... I prefer the iPad surface, it's more expressive.
Here's a vid of me toying around with it...some mindless shredding.