Just to show that I listen to ou guys, if you want to make your Model 15 sync from what it is stock to a very hard, change R28 (a 56K horizontally-positioned resistor right below the SYNC wire on the PCB to 10K. Another option is just floating a 12k over the 56K without removing it - so you solder the leads of the 12 to the leads of the 56K. Just make sure those leads don't touch anything else if you go that route. This is what it'l sound like: http://www.ear-group.net/hardsync.mp3 (I am also sweeping the frequency of the VCO you're listening to in this sample) I will shipping all new VCOs with this mod in. - P
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Hard sync modification - Model 15
2007-04-27 by (i think you can figure that out)