[Leo]

Try to open the drop down menu (when you swipe down the screen) on your Samsung Tab to enter the settings.
There might also be a small entry on top (first row left) of the screen with an USB picture, tap on that.

In any way open the settings for USB und you should be able to select different connection types, such as:
- Data transfer / Android Car
- USB-Tethering
- MIDI --> to be selected!
- Data transfer of pictures
- Charge only

The menu entry on your device may be different, as I'm using a German Tab S7


Gold luck,
Helmut