HX Stomp blocks still missing #5: Specialty delays

The Anagram covers the delay basics well. The HX Stomp adds some specialty types that aren't here yet: ducked delay (repeats get quieter while you play), harmony delay (pitch-shifted repeats in key), pitch/reverse-pitch delay and multi-tap rhythmic delay.

Any of these as a block, or as modes in one delay block, would be welcome.