Correcting Partial Changes in FAC Computer-Generated Tunings Using the Sanderson Accu-Tuner IV

Overview of Partial Changes in FAC (Computer-Generated) Tunings

All ‘computer generated’ tunings include partial changes, and these partial changes may sometimes contain errors. By correcting these errors, the overall sound quality of the tuning can be significantly improved. The number of partial changes present in a ‘computer generated’ tuning will depend on the specific Electronic Tuning Device (ETD) used.

Partial Change Correction (PCC) Procedure for FAC Tunings

This section outlines how to utilize the Partial Change Correction (PCC) feature on the Sanderson Accu-Tuner IV to address the three partial changes that are typically found in an FAC tuning.

  • Tenor: B2/C3
  • Lower Treble: B4/C5
  • Treble: B5/C6

Using the PCC Feature

The PCC feature is straightforward to operate. To activate the correction, press and hold the Sto/Stretch button, and then press RST/MSR. (For additional guidance, refer to the instructional video provided below.)

Additional Uses of PCC

Beyond correcting partial changes, the PCC feature can also be used to shift the entire tuning up or down by any desired amount. For example, if you wish to tune the entire piano sharper by 2.0 cents, begin by selecting a memory tuning in the SAT (such as FAC or any other). Navigate to C8, add 2.0 cents to the current setting for C8, and then press and hold Sto/Stretch followed by MSR/RST. This action will transpose the tuning up by 2.0 cents, affecting all notes below C8 accordingly.

 

PCC and DOB: Understanding Their Roles in Piano Tuning

Overview of PCC Functionality

PCC (Partial Change Correction) operates universally across the keyboard, allowing adjustments to be made to any note. When PCC is used, it changes the stored tuning and these changes are permanent, remaining in memory until further modification. However, the original tuning can be restored by applying PCC with the appropriate settings, effectively undoing previous changes.

PCC vs. DOB Adjustments

Unlike PCC, DOB (Direct Octave Beat) functions as a ‘layer’ type adjustment. It sits on top of the existing tuning without altering what is stored in memory. In contrast, PCC directly modifies the tuning data saved in memory, making its effects persistent until actively changed.

Advantages of PCC Permanence

The permanence of PCC is beneficial because it ensures that any partial corrections made to a tuning remain stored. When the same tuning is reused for the same piano, those corrections will already be in place, streamlining future tuning sessions and reducing repetitive work.

Efficiency in Relocating Partial Changes

If partial changes are relocated to a lower position, completing that process and then using PCC to correct any resulting errors makes subsequent tuning faster and easier. All prior adjustments are retained, making the tuning process more efficient for repeat use on the same instrument.

PCC for Bass Tuning Adjustments

PCC is particularly useful for making more permanent tweaks to bass tuning. Rather than relying on DOB, multiple PCC adjustments can be made to fine-tune the bass, with these changes remaining with the tuning and ensuring consistency across future tuning sessions.