I am not a expert yet, but looking at other racks give me inspiration too ..

I noticed 2 things .

1) MI Peaks, that module is not available anymore, off course it is possible you have it already, or that you can find it on second hand market. or there could be a clone, but I thought better to write it down, to be sure.

2) what Ronin said about the Function, you can also apply to the Contour, but the contour is fully ADSR, if you want that, it is a good choice.
(I have a Contour too, and maths is still on my wish-list, but i have 2 rows, and am planning to go to 3 rows)