Hi Martin, glad to hear you're enjoying the app.
You can fade in/out but only using MIDI bindings. Open the settings in GTL then navigate to MIDI -> MIDI Bindings and then tap the plus + button at the bottom of the view. Scroll down until you see the 'FADE' function under the LOOP header and tap to open the binding view. Trigger a button on your midi controller to assign it to the function. You can also set the fade length and target loop. You can do the latter with groups as well.
