I already had a Launchpad Mini. It sends midi note-on messages on ch 1.
Now, when you change your keyboard to a different channel, you can assign all 81 (!) buttons to piano presets.
In the Midi manager you only need to change ANY into ch1 next to each launchpad entry, in order to prevent triggering a preset, when you hit the corresponding note on your keyboard.

In this way, you can for instance make 8 rows for 8 instruments, and in each row you then can have up to 9 different instances of that instrument. THis works very intuitive.....!!

Thanks for such a wonderful Pianoteq!

Geert