Q: Whats the quartz lock button on 1210's MK3 & 5 for?

[Barely Human]

On the mark IIs can the click at 0% b removed??

I think it can, not sure how to do it tho

I think you can replace the mk2 pitch slider with a mk3 or mk5 slider and you won't have the click any more

I dont think its in the actual slider. I think there is a little switch that it touches above the actual slide rail.