Yes the project has been very impressive, hence why I am building one! http://www.blue-room.org.uk/public/style_emoticons/default/biggrin.gif In terms of the schematic, nothing has changed. Some footprints of components have changed as I had stock of other capacitors and pots so I used these instead of the ones on the parts list. I did read your post on the fiddly mic switch and changed the switch to the vertical type (Farnell 1550098), and moved it further away from the volume control. Hopefully this will help usability. I changed the 8 pin vertical dip switch to a piano type (Rapid 80-0140). The majority of the changes are on the front and rear panels but that involved me redrawing the schematic. I found that Cliff sell a square button for the Alps SPUN switch which is fairly cheap. (Rapid 32-2012) I am designing a 1U dual channel rack unit to act as the master unit, very similar in style to the granite systems. I shall post some pictures when I get building.