After a recent enquiry, I had the idea to replace the ineffective swell circuit with a modified Slow Gear circuit. This has several advantages over the original: it works consistently; it works with the fuzz in both normal and octave modes (the original only works with the octave mode) and it also works on its own.
So, it's a little bigger than the original, but I think it will be much more effective, not to mention more versatile.
The fuzz/octave fuzz is also available without the swell circuit (as the Dust Bunny) , as I believe that quite a few people were interested in buying the Experience minus the sell section, and this was never offered for sale.