This is another pt2399 delay but the filtering looked interesting in the schematic so I decided to give it a try. This is definetly not a transparent delay, it colors your tone but I think all that filters help to tame the noise on some pt2399 IC's so it could be a good candidate if you happen to have one of those.
This looks great and i hate to ask you to do more work, but i would love to see the wiring layout for the extra switches you added and the daughterboard that I assume is for tails.
I would love to have a go a it especially with the options. Thank you for sharing.
Give a man a match and he'll be warm for a day.
Set a man on fire and he'll be warm for the rest of his life.