I tried searching and I hadn't seen anyone mention this yet-- i recently stumbled on a way to use Bluetooth with Caustic in iOS. All you have to do is open GarageBand first, then open Caustic. I was working on something in GB on my BT headphones, and i switched to Caustic for something, and twiddled and edited for a good several minutes before i realized "wait a minute, i didn't have to go get an aux cable just now"
anyway, just thought i should put it out there in case it helps anyone else!
music iz ma favourate
music iz ma favourate