Re: Necker Cube

Hi Joseph,

One can do the two halves of the illusion in FTS as it is:

single instrument -> partials (adding one at a time)
partials -> single instrument (subtracting one at a time)

The part in the middle, fading from one to the other
will prob. have to wait until I program Mary Ackerley's
idea of zones into FTS.

I'll have option that if you change the voices from one
zone to another, you can also choose to fade each voice
into the next one for the same channel.

To do that with the instruments playing partials, one will
need enough pitch bend channels for both custom voices.
since for most of the time, both are playing simultaneously.

That will be okay if one has, say, seven partials plus
fundamental for each, which will prob. be enough.

For more partials than that, will need to use multiple MIDI ports, and
I will need to program the option to spread more
than 15 pitch bends over all the ports (in present
beta preview, you can find this in Out | Multiple MIDI
ports config, as a tick box that doesn't yet do anything).

For now, perhaps one could just do the two halves as
separate wave files, and merge one into the other
for the join?

Here is a first try at it using recorder crystal bells
instead of the crystal bell samples because I haven't quite got
round to figuring out how to use a sample as a sound font.
http://www.robertwalker.f9.co.uk/recorder_cryst_bell_to_shakuhachi.mp3

I've exagerated the volumes of the (slightly) inharmonic
partials from the recording of the crystal bell, as it had
them rather quiet.

The partials are only slightly inharmonic, just enough
to cause beats.

To merge one into the other, just placed them in the two
stereo channels, and faded one out, and the other in.

So if you listen in stereo, you will hear the sound move from
one channel to the other in the middle.

If you (or anyone else) would like to try it out, maybe with
real crystal bells, or some other inharmonic timbre,
let me know, and I'll give detailed explanation of how to do it!

Here is a fractal tune for Rhodes Piano Efurt Cathedral bells and shakuhachi crystal
singing bowls in Thai mode 1 of 7-tet

0 1 1 2 1 2

(I'd use a genuine measured Thai 7 tone equal scale, but
don't have one. Does anyone on the list know of one?...).

http://www.robertwalker.f9.co.uk/fts/thai_mode1.mid

I've set a MIDI upper bound of note 102 for the partials for that one.
Has the occasional missing high note as a result.

Robert

--- In tuning@y..., "Robert Walker" <robert_walker@r...> wrote:

/tuning/topicId_18576.html#18576

>
http://www.robertwalker.f9.co.uk/recorder_cryst_bell_to_shakuhachi.mp3
>

This is very interesting, Robert, and thanks so much for doing it. I
have converted the file to MONO .mp3 and the illusion seems very
effective... I guess the entrance of the shakuhachi partials may be
a little "interruptive" because of the "overblowing" timbre, but
otherwise the "Escher" effect seems quite smooth...

________ _____ __ ___ _
Joseph Pehrson