[PymZiq]

So you need to set the USB connection in the Android OS to "MIDI", not file transfer. This ensures that virtual ports are created for the MIDI device. You can then connect MobileSheets to these virtual ports under Settings->MIDI Settings->Configure MIDI Connections, and you can connect your PC or Mac to those virtual ports to connect to Reaper or Live. 

I do not currently support RTP MIDI because I haven't really found any open source RTP MIDI libraries for Android and/or Windows. It is supported in the iOS version of MobileSheets as Apple supports it with CoreMIDI. I do want to implement my own solution, but this is going to have to wait until I have a big chunk of time I can dedicate to this.

Mike

Hi Mike, thanks for your prompt answer.
"set the USB connection in the Android OS to "MIDI", not file transfer." : I'm well aware of this instruction, but there's nowhere in Android 13 to offer this setting : it looks like since Android 6, this option don't exist anymore for "Midi is natively supported by Android" (not really sure).
=> that's why I've mentioned my attempt with "data transfer" mode, that you can only do when the tablet is in "developer mode".
=> so, any other suggestion ?

I've read across the forum that you're reluctant to adopt technos which require some fee, which is a good attitude. However, in some case, I'd be ok to pay a small extra if such features (proven and reliable) come as an option. Regarding RTP-Midi, it's available for Android as "Midi Connector" which is free for 1 connection and licensed for more. It works fine in my tablet with other midi apps.