4U Spring Reverb
I based the circuit for this reverb on the Music Thing Spring Reverb by Tom Whitwell. It doesn't have the cross fade functionality, as I'm fine with the mixing being done manually or patching via other modules.
The pictured build is actually the second revision of this, and unfortunately has a couple of issues. The controls don't match up with the front panel, and the layout is a bit scrappy. The third revision is in the works and should fix all of these problems.
I've made all the files for this open and licensed under Creative Commons.
The Kicad Project files with schematic, layout and gerbers are available here
All the design and layout files for the panels are up here
Would like to sort out proper BOM files for ease of building