Xpantastic!

Sometimes I press the "tune all" button and it passes the 1st osc only, pressing the button again a bit heavier passes the whole process flawlessly.
IMO, it´s the soft button for "tune all" ( upper row/right), - just mechanical or dust ...

Also no real issues w/ my Xpander her,- tuning is very stable after warm up.

Your case might be more complex because the tuning process passes all the osc and then fails w/ the filters.
This can be the beginning of a CEM chip dies.

Find out which voice fails during filter tuning, swap the CEM3372 chips and see if it happens w/ a different voice now.
If yes replace that chip.
You get the chip @ chip for brains (ebay) and/ or vintage planet.nl and they aren´t as expensive as other CEMs ( 3340 /60 p.ex.).
I got mine for EUR 15.- or 17.- AFAIR.
If you replaced a chip and this voice sounds a bit different then, the behaviour of the voice can be trimmed inside the Xpander.
But you can also try to get 6 CEM 3372 as a matched kit which is not difficult for these type of chip.


eggwheatis schrieb:

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Ok so my xpander fails on first tune of the VCO's and filter, usually
pressing tune for a second or sometime third time eventually get's it
to pass. it dont actually hear any major tuning problems but..

What's the procedure to make the tuning pass first time?

Phil.