[hardy]

ok, bad news here.

I verified that MIDI on cable works fine on MS Android in every combination.
I can use the HX Stomp or the Airstep for connection.

But now I tested the stuff using MS on Windows, connecting to the Airstep using BT.
A Win10 Notebook instead of the Android tablet. Same setup for the devices.
The connection is Notebook to Airstep using BT.

And it works! 

I tested two songs with different settings, and it goes fine.
The Airstep forwards all messages.

That leads to the conclusion, that, at least in my case, MS on Android sends only the first command.
Again, this happens only when using BT MIDI!

No clue whats wrong.