While I do not use the step sequencer or Simple Instrument Tracks, preferring to use the Piano Roll View and the old school Audio+MIDI track layout, I was able, in X2 to drag the TTS-1 from the browser to the project using a Simple Instrument Track, set the first instrument strip in the TTS-1 to the 025 Electric Set, add the Step Sequencer view (Alt+4 keyboard shortcut) and create a loop. Just that easy and it will work the same in MC6 Touch.
I did not worry about altering the MIDI channel, assigning track I/O or which track did what. I am not saying that all of that may not be relevant, useful and it might even be the way that I would work, it is just that it may not be necessary or even appropriate for a beginner. If the OP is interested in the fastest way to start creating loops in MC6T, the historical methods may not cut it. Learning the step sequencer might be a big enough hurdle, at least it is for me, but again, I am a PRV guy and have not spent any time with the step sequencer.