Peterson AutoStrobe 490ST User Manual
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490-ST
NAME
FULL NAME
DESCRIPTION
EQUA
EQUAL
All semi-tone intervals are identical:
12
/
2 or
.6% above previous note.
All keys signatures are equally playable.
PYTH
PYTHAGOREAN
Perfect 4ths and 5ths; 3rds are poor. Avoid G< major and minor keys.
F<, C< major and E=, B= minor diatonic keys are very good.
JUMA
JUST (MAJOR)
Perfect triads in 12 keys: C, G, A, E, E=, F major and A, E, F<, C<, C, G
minor. “Wolf” tones in all other keys.
JUMI
JUST (MINOR)
Perfect triads in 12 keys: C, G, E=, A=, G=, F major and A, E, C, F, E=,
G minor. “Wolf” tones in all other keys.
MEAN
QUARTER COMMA
MEAN-TONE
Perfect/excellent triads in 16 keys. Avoid D=, G=, A=, B major and B=,
E=, F, G< minor keys.
WRK3
WERCKMEISTER—III
Well-tempered; strong differentiation of key color. Avoid D=, G=, A=,
B major and B=, E=, F minor keys.
KRN3
KIRNBERGER—III
Similar to WRK3 but also avoid E=, E major and C, C<, G< minor keys.
YONG
YOUNG
Well-tempered; mild differentiation of key color—most similar to equal
temperament. Avoid D=, E=, G=, A= major and B=, C, E=, F minor
keys.
KLNR
KELLNER
Well-tempered; pleasing differentiation of key color! Avoid G=, D=,
A= major and E=, B=, F minor keys.
P5TH
POWER FIFTHS
Tempered for clean 5ths when playing electric guitar with distortion. (See
also “G5TH” under stretch files in the next section)
Although they cannot be edited directly, one may always copy any one of these permanent temperaments into a custom
temperament which can then be viewed or edited further on a note-by-note basis. The Model 490-ST permits up to 255 user-
programmable temperaments which can be created in this way or “from scratch”.
The FILE (temperament or stretch) menus are accessed under the SETUP screen. Thus, the first step when starting from the
normal RUN screen is to press the “1” button to enter SETUP:
KEY= C
A=440 C 00 ¢
AUTO
SETUP MODE
1
2
3
4
1
SETUP MENU
PLEASE SELECT MODE
OPTN FILE RUN DIAG
1
2
3
4
Accessing the Setup Screen
The next step—accessing the FILE menus—is accomplished by pressing the “2” button (now labeled: FILE):