Next up today @shroprockdoctor (still has no strings) but is at least music oriented, we have a Citronic turntable with direct drive & built in strobe system. This unit also sports a linear pitch controller &individual pitch plus & pitch minus buttons if you want an instant 10% boost or cut in pitch.
Callibration if held tight by hidden trim pots which require adjust if speed is drifting.
Images 1-3 show the static strobe dots at pitch & +/- 10% each on their own lines, post tweeking of trimmers. All controls were treated to a little dose of switch cleaner while exposed.