Let the synth warm up for a few minutes and then adjust the tuning knob.
winnebago wrote:sometimes its out of tune and sometimes it isnt
Unstable capacitor performance can lead to tuning issues. Could it be that some caps are going bad ?
winnebago wrote:Some other times one octave may seem in tune but as I go up the keyboard it drifts further out of tune.
This is a scaling problem, I can provide you with info about how to calibrate it but I am afraid that u can make things worst since the synth is behaving erratically. You got to have a stable operation before proceeding with the calibration procedure.