For long the juno 60 was not a really respected synth, wat was a shame. Now it is seen as a classic. One of the issues with those first analog/digital hybrid synthesisers is that the leak from digital to analog. If you turn the volume up, you can hear some digital noise. With this mod the noise reduces to a more acceptable level. It' simple, just solder one extra heavy wire from ground to ground like in the picture. Make the green isolation dissepear by scretching with a screwdriver or so over the trace. When you use your juno 60 through a distortion (what is great) your gonna love this mod.