Help with midi

[Marcel5]

I recently purchased a PX 8 Plus and love the preset mode but I'm having trouble using its midi capabilities. I only have 1 midi pedal which is the Source Audio Collider. I am new to midi and after reading the manual for the Collider and PX8+ as well as other posts, I'm still stuck. My goal, for example is to have a preset on the PX8+ that uses a slap back delay/reverb sound and then another preset on the PX8+ that has a shimmer sound.

Can someone please outline the steps/ connections/ buttons to press/ needed to do this?

I do have other drive/ effects pedals in the other loops and put The Collider in loop 8.

Thanks so much
Marcel