If you're interested in modifying your old A-110,I made a few pictures of how I did this modifications using the descriptions i found on the Doepfer website and a few other blogs:Find it at http://patchpierre.blogspot.nl/2013/07/a-110-tuning-knob-modification.html http://patchpierre.blogspot.nl/2013/07/a-110-tuning-knob... Triggered by a photo by Scott Rogers that popped up on Flickr a few weeks ago, I decided to re-create the A-110 Oscillator modification that he made. View on patchpierre.blogspot.nl Preview by Yahoo Good luck!Pierre