Let me start by saying that I suspect this isn’t possible. But there are a bunch of clever folks here who might come up with a way to do this.
I’d like to be able to use a continuous controller to vary values on the Tempo Track. Say you’ve got some midi tracks that were recorded at a fixed tempo. It would be nice to subtly speed it up or slow it down over the course of the piece. I know I can do this by editing the Tempo Track. But that is fairly abstract. I’d like to have something more organic, kind of like a tempo fader that would be similar to mixing with a control surface instead of drawing in data.
Of course the initial showstopper is that there is no record enable on the Tempo Track. Anyone got some ideas.