"Peter (Chee Foon Tiang)" <tiangcfoon@HITACHI.COM.MY> writes:
> Calculation
> ===========
> So, you have,
>                                    ___
>              "DO" / middle-C = 12 /    * 220 * 3
>                                 \/  2
>                              = 261.63 Hz
>              "DO" is 3 semitones above the reference note A.

Peter has done the calculation correctly, but he's written down
the intermediate formula wrong.  To calculate "DO"'s frequency,
it's the twelfth root of two to the power of three (not mulitplied
by three), multiplied by 220Hz.

Brian