I set up a basic 64 slice selector/Launcher in TouchOsc to work on track 8 of the octatrack. Pick your slice from the grid and launch it with the green trigger button on the left. Also included a track mute button. Seems to work well for one shots… maybe not so tight for loops.
You will need to route touch osc bridge to the input of a track in your daw and send the midi output of that track to the octatrack for this to work.