Re: [MMM] Korg z1 keybaord scales

Mark,

I found the Z1 midi implementation online and you're right.
Both 12-note and full keyboard tuning is limited to +/- 100 cents.
See global parameter IDs 276-415.

>(one thing I want to try is
>to tune the keys to a segment of the harmonic series,
>say partials 32-64 or whatever, and or aliquot scales.)

Not possible then, only way is via pitch bend.

Manuel

Mark:
>>(one thing I want to try is
>>to tune the keys to a segment of the harmonic series,
>>say partials 32-64 or whatever, and or aliquot scales.)

Manuel:
> Not possible then, only way is via pitch bend.

Well, it might be possible, but it gets hairy. You'd be better with a keyboard that has full MIDI range retuning, but if you've already invested in this one you can play with groups and keyboard ranges.

I don't know how it works from the front panel, but the SysEx data are showing that you can set up a program, and split it into different groups by key range. For each key range you can set the user scale, and coarse and fine tuning values.

For harmonics or subharmonics 32-64, you need 32 notes. I think you get an average of 3 notes at a time before the +/- 100 cents breaks. So you should be able to split the keyboard into 10 or so zones each with a few notes from the full keyboard scale. It's a pain to set up, and it does run out eventually, but it will work.

For experimentation, pitch bend will probably be easier as there's already software that does it.

You can get it to work with more notes if you don't expect the pitch to be monotonically increasing. That'll likely be convenient only if you're using mapping software, which isn't much easier than pitch bending but doesn't have the channel limitations.

Graham

The +-100 cent limitation appears to be correct. I must have gotten
some bum information somewhere. I need to start logging where the
information came from.

There is one possibility. One modulation source is the keyboard notes.
You could use this as a "rough" tuning of notes per octave for the
oscillators and filters, then use the full keyboard microtuning scale to
add the appropriate offsets. This would only be useful if you always
used the same number of notes per octave, otherwise you'll need a unique
voice programmed per scale.

John Loffink
jloffink@...

The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com/

The Wavemakers Modular and Integrated Synthesizer Web Site
http://www.wavemakers-synth.com/

> -----Original Message-----
> From: Graham Breed [mailto:graham@...]
> Sent: Tuesday, February 25, 2003 6:53 AM
> To: MakeMicroMusic@yahoogroups.com
> Subject: [MMM] Re: Korg z1 keybaord scales
>
> Mark:
> >>(one thing I want to try is
> >>to tune the keys to a segment of the harmonic series,
> >>say partials 32-64 or whatever, and or aliquot scales.)
>
> Manuel:
> > Not possible then, only way is via pitch bend.
>
> Well, it might be possible, but it gets hairy. You'd be better with a
> keyboard that has full MIDI range retuning, but if you've already
> invested in this one you can play with groups and keyboard ranges.
>
> I don't know how it works from the front panel, but the SysEx data are
> showing that you can set up a program, and split it into different
> groups by key range. For each key range you can set the user scale,
and
> coarse and fine tuning values.
>
> For harmonics or subharmonics 32-64, you need 32 notes. I think you
get
> an average of 3 notes at a time before the +/- 100 cents breaks. So
you
> should be able to split the keyboard into 10 or so zones each with a
few
> notes from the full keyboard scale. It's a pain to set up, and it
does
> run out eventually, but it will work.
>
> For experimentation, pitch bend will probably be easier as there's
> already software that does it.
>
> You can get it to work with more notes if you don't expect the pitch
to
> be monotonically increasing. That'll likely be convenient only if
> you're using mapping software, which isn't much easier than pitch
> bending but doesn't have the channel limitations.
>
>
> Graham
>
>
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By the way, Mark or John, do you know the Z1 expects
the sysex values to be packed in two 7-bit numbers? I couldn't
figure this out from the midi implementation.
The tuning numbers are -100 to 100. Is there an offset of 8192?
Or is it two's complement? Thanks,

Manuel