When Roger Linn saw this at the Create Digital Music competition at NASA Ames he called it "Final Scratch on Steroids"
I wouldn't go that far, but I would call it a feature missing from all
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commercial time-code vinyl products.
ammoBox features a primitive but effective time-code decoder that allows the use of any time-coded vinyl as an input source for Reaktor, this module is called 'HangTheDJ' and simply emits a positive or negative floating point value indicating time-code playback speed. (-1.0 == 33rpm backwards, +1.0 == 33rpm forwards)
As well as an example of how to use HangTheDJ, there is a MIDI triggered sampler that uses HangTheDJ as a sample playback mechanism, when a sample is triggered it is injected into the playback stream that HangTheDJ can then manipulate the speed (forward or backwards) allowing 'scratching' of samples. [Less]