(tapping) on the PHASER/TREMOLO switch, if the P/T switch is set
to TREMOLO, or if it is set to PHA+TREM and the tremolo is ON.
G) PHASER Function
A phaser works by running the signal through an all-pass filter to shift its
phase as a function of frequency, then mixing this signal back into the
original signal, creating a series of notches in the frequency response,
also known as a comb filter. The amount of phase shift is modulated up
and down, resulting in the notches shifting up and down in frequency
depending on the rate setting. It has a mono output.
1. PHASER (OFF or ON): The phaser can also be turned on or off by
pressing the switch marked PHASER/TREMOLO, if the P/T
SWITCH parameter within the Switch function is set to PHASER or
PHA+TREM.
2. RESONANCE (OFF to
–2): Controls the amount of feedback within
the phaser. This affects the shape of the notches or ‘teeth’ of the
comb filter, and also the time-domain decay of the response.
3. PHASER DEPTH (0 to 100): Controls the mix between the original
signal and the phase shifted signal, which varies the depth of the
notches in the comb filter, and hence the amount of the effect.
4. PHASER RATE (1 to 127): Higher numbers give faster rates. The
rate can also be controlled by pressing 2
nd
, then pressing twice
(tapping) on the PHASER/TREMOLO switch, if the P/T SWITCH is
set to PHASER, or if it is set to PHA+TREM and the phaser is ON.
5. PHASER STAGES (4, 6, 8 or 10): The number of stages in the all-
pass filter, which gives more phase shift, which then results in more
notches in the comb filter. A certain
widely used ‘classic’ phaser
pedal has 4 stages.
H) CHORUS/PSHIFT Function
In V2 software, the CHORUS function has been modified by addition of
PITCH SHIFT mode. When the pitch shift is active, the chorus is disabled.
A new parameter has been added to the chorus to switch between the two
modes. The pitch parameters are accessed by turning the FUNCTION
knob one click clockwise, then using the PARAM knob to select the
parameter to adjust.
A chorus works by running the signal through a short delay of about 20
ms, and mixing the delayed signal with the original. The delay time is
modulated according to the rate and depth, creating a small amount of
pitch bend in the delayed signal. The Theta Pro DSP has 4 voices, each
separately delayed, modulated, and panned left or right, providing a lush
stereo output.
1. CHORUS (OFF or ON): Controlled via VALUE knob or the
CHORUS/FLANGER switch. For footswitch control, the C/F