I remember back in the day NI had a box that worked with traktor that came with some special vinyl records that had encoded signals built on it. You ran the out

I remember back in the day NI had a box that worked with traktor that came with some special vinyl records that had encoded signals built on it. You ran the output of the record players into the 'traktor box' and it would turn this into positional information for traktor .. seems like they still make the records: https://www.native-instruments.com/en/catalog/hardware/traktor/digital-vinyl/ https://www.native-instruments.com/en/catalog/hardware/trakt... I think the product, back in the day, might have been called traktor scratch.