The best replacement for memory boy is memory man.

The best alternatives to memory boy are rated as following:
★★★★★  memory man
★★★★  memory toy
★★★★  aqua puss
★★★  dd7
★★★  boss dd7
★★  carbon copy
★  nova delay
  dl4
  supa puss

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Speaking about memory boy, one probably shouldn't forget about expression pedal.

Other search terms related to memory boy and their ratings are:
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