Mock tuning test ??

[Robert Scott]

Jim Bryant asks:

>How were the "de-tuning values" determined? Just curious.

The goal of a de-tuning is to make every note require tuning by the
examinee without changing the average pitch of the whole piano so that
pitch-raise techniques will not be required.  This goal is achieved 
by alternately raising or lowering each pitch by four times the 
allowable tuning tolerance for that note.  So the de-tuning offsets 
in cents are:

C1:  -24 +24 -24 +24 -24 +24 -24 +24 -24 +24 -24 +24
C2:  -12 +12 -12 +12 -12 +12 -12 +12 -12 +12 -12 +12
C3:  -4  +4  -4  +4  -4  +4  -4  +4  -4  +4  -4  +4
C4:  -4  +4  -4  +4  -4  +4  -4  +4  -4  +4  -4  +4
C5:  -8  +8  -8  +8  -8  +8  -8  +8  -8  +8  -8  +8
C6:  -12 +12 -12 +12 -12 +12 -12 +12 -12 +12 -12 +12
C7:  -24 +24 -24 +24 -24 +24 -24 +24 -24 +24 -24 +24

These offsets are applied to the master tuning.

-Bob Scott