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#X text 50 -32 Linear frequency chart -- cut this down the middle and
use as a slide rule to compute frequency shifts. The longer lines are
staves with the bass and treble clef. The numbers are the MIDI pitches.
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#X text 53 5 FREQUENCY SHIFTER SLIDE RULE.;
#X text 23 32 This might help you if you need to compute products of
frequency shifting and/or FM spectra. Print and cut in half down the
middle. If you know the pitches associated with two frequencies a and
b \, align the pitch of a on the left side against the zero-frequency
marker on the right side. Then find the pitch of b on the right \,
and the matching pitch on the left corresponds to the frequency a+b.
To get a-b \, find b on the left and look up the corresponding pitch
on the right.;