After recently mentioning that I should break out my old copy of ReBirth to make some music my attention was well and truly rapt by Auxy in the App Store today.
Dubbed a "mobile studio" it lets easily you combine drums and synths (bass and lead) using a basic piano roll and pattern sequencer.
But basic it isn't!
The ease with which you can throw something together and even automate controls and effects is remarkable.
I've been playing with it on and off all day and quickly come up with this: