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.
Semi OT: DIY Bluetooth foot controller
My DIY Bluetooth foot controller is complete and I am quite happy with the results. I figure some of you may appreciate this sorta thing:
At @SecretBaseDesign's suggestion, I bought an Ion iCade Core from eBay for cheap and pulled out the buttons, circuit board, and battery pack. My first prototype used the buttons from the iCade:
As you can see from the sticky notes, this allowed me to correlate the buttons with the Side Car app that I use to "catch" the Bluetooth messages and transmit MIDI CCs to Loopy, ToneStack, and MiMix:
I wasn't completely happy with the iCade buttons because I mistakenly activated some while stepping on others with my size 13 feet, so I bought some guitar pedal switches from a supplier in Singapore (slow delivery but dirt cheap) and mounted them in the new enclosure. The wiring/clips from the iCade attach easily to the new switches; no soldering required!
Now, I have eight different options at my feet connected wirelessly with my iPad; spent maybe $40 total?