I found this interesting post on TGP, while I was looking for those actual preset patterns in the Boss.
https://www.thegearpage.net/board/index.php?posts/27364571/
It’s been a long time since I’ve run through an SL-20. I don’t know how close you could come to those patterns with the H9’s HarPeggiator (Rhythms & Sequences; or Effects). Here’s a few presets to get you started:
https://www.eventideaudio.com/community/forum/stompboxes/seq-view-50-harpeggiator-presets
