Tidal Synth: how to assign a value to a variable?

[Squim]

I think you need special syntax to call a variable inside of a pattern. This discussion seems to be about that but I can't seem to get it working:

Using variables within patterns

Apologies if this has been answered elsewhere, had a search but couldn't quite find what I was looking for. I'm trying to figure out how to use a variable in place of one part of pattern. I know that you can define a whole pattern in a variable like this: do let structPatt = "[t(< 2 1 3 1 >,4,< 0 2 1 >)]*4" d1 $ struct structPatt $ n "0 3 7 10" # s "superchip" But what if you wanted to have just part of that pattern be a variable, so something like: d1 $ struct "[t(< VARIABLE_HERE!!! >…

edit: also might want to pick a variable other than "f" for inside of a pattern since that can be an f note or a false statement - both of which can be in patterns.