I spent a few more minutes fiddling. If I plug my tablet into my keyboard, it works the way you expected: I get pop ups requesting access, asking if I want to start MSP when this device is plugged in, etc., and then the MIDI magic works on loading my song.
If I plug it into my MOD DUO pedal, it's as I saw last night: I get no popup; instead there's just a note in the notifications that I can click on that allows me to choose what I want to use the USB connection for--I choose MIDI, but nothing happens. The MIDI Keyboard app works, MSP doesn't.
The important difference may be that the DUO is acting as a USB host, and the keyboard as a USB device?
(Anyway, if you want a guinea pig for testing of the new android MIDI API, I'm happy to test stuff.)
If I plug it into my MOD DUO pedal, it's as I saw last night: I get no popup; instead there's just a note in the notifications that I can click on that allows me to choose what I want to use the USB connection for--I choose MIDI, but nothing happens. The MIDI Keyboard app works, MSP doesn't.
The important difference may be that the DUO is acting as a USB host, and the keyboard as a USB device?
(Anyway, if you want a guinea pig for testing of the new android MIDI API, I'm happy to test stuff.)