Hiya
there is a blue crystal on the board, it is like a blue blob with two metal legs, i think its right next to the biggest chip in there. It kinda stands out when you look for it. You have to remove this and take the signal lead of the oscillator and attach to the circuit board where the side of the crystal that was controlling the clock signal was (easy to find out remove a leg at a time of the crystal and if it doesnt work there is your signal) The machine only needs a signal from one leg to work. I hope this makes sense, i've made it so i can flip back and forward between the oscillator and crystal. So i get normal or variable pitch. To be honest i always leave it on normal pitch when switching on or off, because these oscillators play about with actual speed the cpu and stuff work at as well. You cant use this pitch mod with midi. Any questions i'll try and answer them.