[Henry Lowengard]

The world is kind of on pause right now, but there’s a kickstarter that succeeded is for the re.corder, a recorder that is also a MIDI Controller Over Bluetooth LE, and I suspect it can pick up breath control. That’s the main thing for simulated melodicas, you’ll want a speedy breath control to merge with whatever note events you can put out on some other device.

Here’s an Arduino hackable one: https://hackaday.io/project/161678-usb-midi-breath-controller.You’d probably want to add a MIDI IN to help it merge into the system, and make it something you plug right into the cable between a controller and a synth module.