Ton,
I don't know about any tutorial that I could link to, but I can describe how to setup the MIDI connection.
First, connect the Keyboard to your PC -- you can use the USB-Host connector, or in my case, I use the MIDI connectors.
If you use the MIDI connectors, you'll need an adapter, I use the Roland UM-1 to USB adapter.
Now go into MobileSheets Settings > MIDI settings page. There are 2 settings you need here:
MIDI Device Type > (Genos, PSR-SX600/700/900) and
Select MIDI Devices > check the box for the Input Device, and Output device
I left all the other MIDI settings on their defaults, and it works very reliably.
To use with a keyboard registration, select the registration on the keyboard.
In MobileSheets, select the Song page that you want to link to, and click on the page so that you can edit it.
Click the tool that looks like a Pencil at the top of the page, and you can get to the MIDI settings for this Song.
You should now see a chain link icon on the right side ---- simply click on it once, and the MIDI commands are automatically linked for you.
Notice that there are 2 commands, one to [Send on Load] and one to [Load on Receive]
The Song and the Registration are now linked in both directions. Hope this helps you get going!
Jerry