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Stereo Phasing; Tremolo; Symphonic; Pitch Change - YAMAHA SPX90 Operating Manual

Digital multi-effect processor.
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STEREO PHASING

The SPX90 can produce a wide range of Phasing ef-
fects from a barely perceptible shift to a rapid pulsa-
tion. Phasing lends an animated quality to musical in-
strument and vocal recordings:
This effect has the same parameters as STEREO
FLANGE, except that the DELAY TIME range is from
0.1 to 8.0 msec and omits FB Gain.
The TREMOLO effect operates in the same way as the
CHORUS effect, except that modulation is deeper and
the delay variation is greater. Refer to STEREO FLANGE
for the description of the parameters.

SYMPHONIC

The programmable parameters for this preset are iden-
tical to those for the Stereo Flange preset, omitting
FEEDBACK GAIN and MOD DELAY.
13

TREMOLO

This program is used to change the pitch of an input
signal. Pitch can be changed in semitone increments
over a plus/minus one-octave range. Fine adjustment
of pitch in one-cent (1/100th of a semitone) incre-
ments/decrements is also possible.
Pitch change programs B and C permit setting two dif-
ferent pitches. This makes it possible to produce har-
monizer type effects (i.e. when you play a note the
SPX90 outputs two additional notes), or, if only a slight
pitch difference is used, chorus-type effects are
created.
Pitch change programs A and D permit the application
of feedback so that an echo that changes in pitch with
each repeat can be produced. Programs A and D fur-
ther permit pitch control via the MIDI IN connector. Any
MIDI synthesizer, such as the Yamaha DX7, can be us-
ed to alter the pitch setting of the program by simply
playing the appropriate note on the synthesizer
keyboard.
PROGRAM

PITCH CHANGE

1 TONE
PITCH CHANGE A
2 TONES
PITCH CHANGE B
(CENTER)
2 TONES
(1 EACH IN
PITCH CHANGE C
L & R CH.)
1 TONE
PITCH CHANGE D
1. PITCH. Range: – 12 ~ + 12
Sets the degree of pitch change in semitone steps.
+ 12 corresponds to an output pitch one octave
higher than the input pitch, and – 12 produces an
output pitch one octave lower than the input pitch.
2. FINE. Range: – 100 ~ + 100
Adjusts pitch in one-cent increments or decrements.
3. DELAY Range: 0.1 ~ 400 msec (A, B, D), 0.1 ~ 200
msec (C)
Sets the delay between the direct (input signal) and
the pitch-changed output signal.
4. F. B. GAIN. Range: 0 ~ 99% (A, D only)
The higher this setting, the more echo repeats are
produced (each changed in pitch from the previous
repeat).
5. BASE KEY. Range: OFF, C1 ~ C6 (A, D only)
This parameter sets the "BASE KEY" for an exter-
nal MIDI synthesizer used to control the pitch varia-
MIDI PITCH
FEEDBACK
CONTROL
YES
YES
NO
NO
NO
NO
YES
YES

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