Hi Matt. For some reason, I often experience connection problems between my MacBook Pro and iOS devices i.e. sometimes they'll pair and connect perfectly, and other times they simply refuse to connect. I've found that a couple of things help i.e. disconnecting physical devices from my MBP (e.g. USB/FireWire/Thunderbolt) and holding down SHIFT + OPTION when clicking on the Bluetooth icon in my Mac's menu bar, then selecting "Debug" and "Reset the Bluetooth module". However, my question to you is this: what's the difference between initiating the Bluetooth MIDI connection on a Mac (i.e. using the iOS device as a Bluetooth Peripheral and advertising its MIDI port for the Mac to connect to), and initiating the connection on an iOS device (i.e. using the iOS device as Bluetooth Central and advertising the Mac's MIDI port for the iOS device to connect to)? For me, sometimes one method works and not the other, and vice versa...there's no pattern as to when each method will/won't work. Apart from an iOS app lacking Bluetooth MIDI functionality, I can't find any rationale for one connection method over the other. Cheers Gary