All ‘computer generated’  tunings have partial changes and those partial changes may contain an error.  Correcting these partial change errors can greatly improve the sound of the tuning.  The number of partial changes contained in the ‘computer generated’ tunings will vary depending on the ETD.

This procedure will show how to use the Partial Change Correction (PCC) feature on a Sanderson Accu-Tuner IV to correct the three partial changes (3) found in an FAC tuning.

The locations of the 3  FAC tuning partial changes are :

  1. Tenor:  B2/C3
  2. Lower Treble:  B4/C5
  3. Treble: B5/C6

PCC is really a simple feature to use.   The button pressing command is to press and hold Sto/Stretch and then press RST/MSR.

(Watch the Video below)

In addition to correcting partial changes, PCC can be used to move the whole tuning up or down by whatever amount you want.

Lets say, you want to tune the whole piano sharp by 2.0 c.  Using a memory tuning in the SAT (FAC or whatever), go to C8 and add 2.0 c. to the setting found on C8 and then press (and hold) Sto/Stretch then press MSR/RST.   That’s all there is to it.  The tuning  has been transposed up 2.0 c.   All the notes BELOW C8 have been moved up by 2.0 c.



PCC works anywhere on the keyboard.

PCC changes the stored tuning and is permanent.  But the tuning can be put back to it’s original state by using PCC with the correct setting.

However, DOB is a ‘layer’ type adjustment, sitting on top of the tuning.  PCC actually changes the tuning stored into memory.

PCC ‘permanence’ is a good thing because it stays with the tuning in Memory.   That means once the partial changes have been corrected for a tuning, when the tuning is used again for tuning the same piano, the partial changes will have already been corrected.

Another plus for all this is if the partial changes have been relocated lower.   Getting that done, and then using PCC to correct any partial change errors, makes using the tuning again, on the same piano a much quicker and easier tuning, since all that work has been done and has been stored with the tuning.

PCC can also be used for a bit of a more ‘permanent’ tweaking of the bass tuning.  Instead of DOB, a number of PCC adjustments could be used to tweak a bass tuning and have those tweaks stay with the tuning.


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