re: Quicktime pitch resolution (was Cubic lattice of chords)

Hi Paul,

I've done a test by setting the output for Quicktime to Midi Yoke instead
of its own internal synthesizer, then recording that in FTS.

This shows that in that situation it changes the pitch bend range to 24 semitones
before relaying the notes - i.e. +- 12 semitones, giving a resolution of 0.15 cents.

I remember discovering that before.

Not sure how that relates to the quoted pitch bend units for its
internal synthesizer as that seems to suggest a pitch bend range of
-64 to + 63 semitones.

Pitch bends are expressed in 14 bit integers, so if the coarse
part of that was used for a range of 0 to 127 semitones, then
the fine part would have to be 0 to 127 units / semitone.

If the fine part and one bit of the coarse part was used
you could have 0 to 255 units for each semitone, and
a range of -32 to + 31 semitones for the pitch bends.

Robert

--- In tuning@y..., "Robert Walker" <robertwalker@n...> wrote:
> Hi Paul,
>
> I've done a test by setting the output for Quicktime to Midi Yoke
instead
> of its own internal synthesizer, then recording that in FTS.
>
> This shows that in that situation it changes the pitch bend
range to 24 semitones
> before relaying the notes - i.e. +- 12 semitones, giving a
resolution of 0.15 cents.

well this is neither 128 nor 256 parts per semitone, but rather
over 600! seems like kind of a mystery, huh?