I've made some changes to my JH Interpolating Scanner(s) and have put a new FPD file up on my website. There was an empty spot on my previous panel (what was I thinking?) which I've filled in with an LFO output jack. I also tackled the thorny issue of how to use MOTM-standard Lumex LEDs and get them bright enough to actually see them. The solution isn't simple but it works great.
Look here for full details including schematic, 3U FPD file and lots of construction photos.
http://www.tellun.com/motm/mods/jhscanner/jhscanner.html