Do you have a button in the ttm that was used for this differentation in vestax compatible cdj. You could use it to activate scratch mode. It is not convenient to alway pushing a button when you would like to scratch or manipulate the vinyl. I use some kind of intelligence instead when the velocity change over time is big enough, it means you are scracthing. When it gets low, it means you stopped. It should be derived from turntable velocity in non scratch mode and obvied in scratch mode due scratching is handled pitch control of the waveform (no?) Yes basically, You should eliminate the fluctuations, and you should be able to activaty the pitch mode if the dj just slightly touches the palatter. Usually in dvs timecode one channel goes backwards and the software use both signal comparation to accurate the analysis. I can uplad some technical documentation from Ms. Pinky Sdk if someone wants to take a look but I will do it this afternoon (now it is 15:06pm) or tomorrow. I think i'm talking avout a different thing. In a DVS time code you have 2 signals 90 degrees shifted thats true. I'm talking about how to send the calculated relative speed to the PC or iPad, instead of sending MIDI messages, which is slow. And the alternative could be data sent over audio channel which is usally used to send the digitized vinyl audio, but now as we process it externally, we can use the audio channel to send the pre-processed data.