hi simon, hope this finds you well. i think you should respectfully part with marbles. teletype can take over most, if not all, of its duties.
as a primary clock, it works wonders. you can set individual “section” tempo per scene, or even change the tempo in real time for live performance. scripting tempo is not as straightforward as twisting a knob in ableton, but it’s easy to get a handle on its flexibility once you’ve done a few scenes.
with regard to quantisation, i continue to defer to tt since i intend to use it as the brain for structured patterns in live performance, the hub from which all song data is generated (key signature, tempo, form, etc.).
best