I traced this one a while back. It's the same delay circuit as the Disaster Transport Jr but with modulation added. It fits nicely in a 1590BB like the original. Schematic here.
If you'd rather a smaller footprint I have fabricated boards for a 125B in the store.
How about making board for one of the double pedals from Xotic https://www.freestompboxes.org/viewtopic.php?t=33712
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