The A4 Numbers
The “A4 numbers” are the locations of the 2nd, 4th, and 8th partials of A4 when A4 is tuned to A440 (1st Partial).
Robert Conrad, Registered Piano Tuner/Technician, Tucson, AZ
The “A4 numbers” are the locations of the 2nd, 4th, and 8th partials of A4 when A4 is tuned to A440 (1st Partial).
There are a number of ways, when using an AccuTuner, to tune to non standard pitch. PCC is one of the easiest and most versatile. When PCC is used for tuning to non standard pitch, make note of the PCC adjustment so it can be reversed when the tuning is finished.
Using a sequence is a great way to quickly tune and make aural checks before committing to the complete tuning. (Contains button pressing video).
All computerized tunings have partial changes and those partial changes may contain an error. Correcting these errors can improve the sound of the tuning. This procedure will show how to correct the three FAC partial changes when using an AccuTuner SAT IV. But before correcting the partial changes, consider lowering the tenor partial change from…