Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
Dreaming of a Polyend Tracker/Renoise-style app...
and, really, just posting to maybe wish it into the world. SunVox is a beast, but not optimized for iPad in any real way - it has a janky/cumbersome interface and workflow, particular re: its modular effects/engines and scattered menus. VividTracker also has interface/workflow issues, while Nanoloop and SidTracker64 are aimed firmly at the chiptune niche. Given the Polyend's popularity, a well-designed, equivalent, robust app tracker would probably be a must-buy for many of us - particularly those who grew up on D&B and Aphex records.
Bonus: Bluetooth QWERTY keyboards are cheap as chips and the iPad CCK works comfortably with the wired variants most of us already have, so controller buy-in would be minimal, as well.
I'm probably going to just drop $75 on Renoise for now, but the iPad really is my preferred platform for electronic stuff. If a Polyend killer arrived on the scene, I'd scoop it up. I assume I'm not alone here?