I think you did not understand the concept. It does what you want…

1. Do your program as you like.
2. Do a Hotswitch with more distortion on H1

3. Do the same (or different) distortion on H2 and add desired pitch.
4. On H3 you can e.g. do even more Distortion and another pitch.

This gives you flexibility over your sound. 1 Sound/ Program and 4 variations. This is better instead of just adding up things – from my perspective.

I use an expression pedal in addition. Perfect to blend in more distortion and more pitch with dynamic (as an example).