I think you have a grounding problem going on in the neighborhood of the
NTO and PCO boards.
Examples: problem with grounding wire that runs from board to board, a
solder blob/metal sliver making contact against the INSIDE of the front
panel and some electronic part.. Check for any insulation
cracking/defects in the board-board power wiring and
board/jack/switch/pot wiring.
Try touching all the board-to-board power supply wiring & see what
happens. Carefully take the whole panel out and unscrew/unfold the
panel-rack assembly so you can see what's going on with the wiring.
Also, try a can of dust-off carefully on the boards and inside of the
front panel.
With the panel opened, hold it upright and tap it gently with a hard
object - see if any tiny thing falls out.
Another, more remote possibility, an electrolytic coupling cap or
semiconductor going bad.
You may try to isolate the problem by disconnecting the PCO or NTO from
the power lines - this is more difficult technically since everything's
daisy chained but it may reveal the true culprit.
The pots aren't the problem - you replaced them.
The PS4 isn't the problem - your other panels are working fine, right?
The PCO & NTO should not be soft-syncing unless you patch them that way.
NTO and PCO boards.
Examples: problem with grounding wire that runs from board to board, a
solder blob/metal sliver making contact against the INSIDE of the front
panel and some electronic part.. Check for any insulation
cracking/defects in the board-board power wiring and
board/jack/switch/pot wiring.
Try touching all the board-to-board power supply wiring & see what
happens. Carefully take the whole panel out and unscrew/unfold the
panel-rack assembly so you can see what's going on with the wiring.
Also, try a can of dust-off carefully on the boards and inside of the
front panel.
With the panel opened, hold it upright and tap it gently with a hard
object - see if any tiny thing falls out.
Another, more remote possibility, an electrolytic coupling cap or
semiconductor going bad.
You may try to isolate the problem by disconnecting the PCO or NTO from
the power lines - this is more difficult technically since everything's
daisy chained but it may reveal the true culprit.
The pots aren't the problem - you replaced them.
The PS4 isn't the problem - your other panels are working fine, right?
The PCO & NTO should not be soft-syncing unless you patch them that way.