Thanks @jaffasplaffa and @dontjudgedave!
Have got that going. All good.
However, when I start up a sequence on the Beatstep, then it doesn't wanna play...(ok, i've worded that in a way that might be confusing - I don't mean the sequence doesn't want to play, I mean the midi learn thing doesn't wanna play ball )
So, I can play a pad on the BS and change the chosen parameter, but once I kick off a sequence, the dial doesn't respond. Any ideas?
Thanks again for your clear and rapid responses!