Thanks both.

I think I searched the manual only for 'expression', 'continuous' and then 'continuous control' to try to limit the number of hits, and I visually searched the index for similar texts. None showed, but bits I did find implied there was a way ... I just never found it.

JOM's chapter link showed it up quickly enough. I'd found the option on the piano roll, but it didn't show Expression (which is what I want) ... it appears one has to choose 'Control' then the CC number. Not unreasonable; I just never found it. Once I understood when editing it, what the red line that appeared meant, things seemed reasonable. I'll give it a proper go. I'd rather hoped for a record option from my controller pad, but it looks like there may not be one and spot editing may be the only way. That has has also helped with another issue. I guess I'd also expected to find it on the Tracks view, as there's already volume-automation(?) there.

Once I found that 'E' icon, that's also good to know, and again for things other than my present challenge.

This seemed a good time to try out RealBand ... I haven't before because I already have several DAWs that usually do what I want, but this time I was using a downloaded MIDI to make a cover of an existing song for a local dance group's publicity and I want to avoid copyright issues as far as possible. Usually I take the chord progression and build a style that has the right feel, but this time they were specific about "this song expresses our attitude". The song's chord progression is boring ... take out the melody and harmony hooks and there's basically nothing left. I need the hooks, maybe also the words, though there's usually a voice-over, with which the vocals conflict.

Jazz relative beginner, starting at a much older age than was helpful.
AVL:MXE Linux; Windows 11
BIAB2025 Audiophile, a bunch of other software.
Kawai MP6, Ui24R, Focusrite Saffire Pro40 and Scarletts
.