Use the delay range switch on the Raster 2 to shift quickly between real time, half time, and double time, to make simple rhythmic changes on the fly.
Begin with [ALT] parameters neutral:
https://youtu.be/Z7M7pjdafQY
To change the tap tempo/MIDI clock note divisions, hold the [ALT] button while adjusting the same toggle switch to select between 8th, dotted 8th, and quarter notes. More note divisions are available via the web editor, TouchOSC, and MIDI.