Quote Originally Posted by IQ
On technics, they have always used Quartz to keep the platter spinning bang on time. Just like how a quarts watch works. On the mark 2, if you put the fader in the middle, then the quartz lock will come on and the turntable will be spinning at exactly 33, or 45 rpm. Because of the way they did it on the mk 2, it caused many problems for mixing, for one, the click is annoyng, and also if your decks arnt perfectly calibrated, or have been deliberatley sped up, then when you pass the slider over the quarts lock, it will drastically speed up or slow down the platter.

To overcome this, they removed this function from the actual slider itself, and made a seperate button for it. If the quarts lock is switched off, the the pitch slider will work as normal. If the quartz lock is switched on, the the pitched slider is bypassed and wont work at all, the turntable will just play at exactly 33, or 45 rpm...
Nice one mate. Thanks for the info. Its a pretty pointless button really then.