Does anyone here know of anyone who has modified a DJ turntable (eg Technics SL-1200) so that you can obtain an electronic reading of the rpm? In such a way that if you scratch the deck you can reproduce the scratching in software.
I was thinking of using a light sensitive diode to detect the movement of the black dots around the edge of the platter. This would be easy to add to many turntables without opening them up or doing anything else.
The only condition is the turntable has to be modified in such a way that it is still usable as a normal deck. I.E no special records or similar
Any help appreciated.