Yamaha TX81Z Product Manual page 32

SINGLE: Utility
Micro Tune?
Edit Octave?
Init Octave?
Now press up to four notes on the keyboard. When you release all the notes,
the new chord notes will be displayed. If less than four notes are pressed, a "*"
fills the empty space. In this way, you can specify up to 12 notes and a four-
note chord for each. You can also use DEC/INC to specify the chord notes
within a ±2 octave range. The blinking cursor will appear when you press DEC/
INC.
The TX81Z has 13 microtonal scales (11 preset and 2 user-programmable), one
of which can be selected for use in a performance (p.41). This is where you edit
the two user-programmable scales. Press YES and use the PARAMETER keys
to select the four jobs.
Here you can edit the 12 notes of the user-programmable octave. The tuning of
each note will be repeated in steps of 1200 cents (one octave) up and down the
keyboard. Press YES. Use the PARAMETER keys to select C3-B3 and use
DEC/INC to change the tuning for each note. As you change the tuning, the
absolute pitch is calculated and displayed in steps of 100/64 cent (about 1.56
cents) ranging from 0 (C#-1+0) to 6143 (C7+32). This covers the entire range
of the TX81Z's sound-producing capability.
Here you can initialize the user-programmable octave to one of the 11 preset
scales. When creating your own scale, it may be faster to start with one of these
preset scales. Press YES and use the PARAMETER keys to select preset scales
1-11. You can play the keyboard to hear the currently selected scale. Press
YES again to initialize to the selected scale. (Press NO to escape.) For Pure,
Mean Tone and Pythagorean scales, you can also choose the tonic (first note)
of the scale. Move the cursor to the "key" area and select C-B using the PARA-
METER keys. (No matter what tonic you select, A3 will always be 440Hz.)
1: Equal
2: Pure (major)
3: Pure (minor)
4: Mean tone
5: Pythagorean
6: Werckmeister
For the tuning details of scales 1 to 8, see the data tables on page 49. 1/4 Shifted
Equal Temperament (scale 9) is the normal scale shifted up 50 cents. When 1/4
Tone (scale 10) is used, each key produces an interval of 50 cents (ie. play 24
keys to move one octave). When 1/8 Tone (scale 11) is used, each key produces
an interval of 25 cents (ie. play 48 keys to move one octave). When 1/4 tone
or 1/8 tone are used, the C2 key (key number 48) will produce the pitch of
normal C3.
7: Kirnberger
8: Vallotti & Young
9: 1/4 Shift eql
10: 1/4 Tone
11: 1/8 Tone
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