Feedback Knob - Electro-Harmonix Cathedral Stereo Reverb Manual

FEEDBACK KNOB

The FEEDBACK knob controls the amount of signal that is sent from the output of the delay
block back to the input of the delay block. With a delay time long enough to hear discrete
echoes, turning the FEEDBACK knob clockwise will cause the delay block to produce
multiple echoes from one note. Each echo then goes into the reverb block producing
multiple reverb washes from one note.
DAMPING/TONE KNOB
The DAMPING/TONE knob controls frequency shaping in all modes except GRAIL FLERB,
giving the musician the ability to fine tune the sound of their reverb or echoes. The knob
acts as a damping control for HALL, ROOM and PLATE modes, a standard tone control for
GRAIL SPRING, ACCU SPRING and REVERSE modes, a low pass or high pass filter in ECHO
mode and a resonance control in FLERB mode.
DAMPING – In HALL, ROOM and PLATE modes, this knob will increase or
decrease the amount of the damping applied to the reverb. Increased damping
reduces high frequency content as well as changing the reverb's special
characteristic. As you turn this knob clockwise the damping factor applied to the
reverb is reduced.
TONE – In GRAIL SPRING, ACCU SPRING and REVERSE modes, this knob will
increase or decrease the treble response of the reverb. As you turn the knob
clockwise, the sound of reverb will get brighter. Turning the knob fully counter-
clockwise will yield a very dark reverb. Set to 12 o'clock and no filtering is applied
to the reverb.
RESONANCE – In GRAIL FLERB mode, this knob is a resonance control for the
flanger portion of the effect. It will control the amount of feedback from the
output of the flanger to its input. As you turn this knob clockwise the resonance
will increase, giving you a sharper sounding flanger effect.
LOWPASS/HIGHPASS FILTER – In the ECHO mode, this knob works as both
a low pass filter or a high pass filter. The left-hand or counter-clockwise side of
the knob controls the amount of Low Pass filtering. The further you turn the
Filter knob down to its minimum counter-clockwise position, the lower the cutoff
frequency of the low pass filter. This means less high frequency response or a
large reduction in treble. The right-hand or clockwise side of the knob controls
the amount of High Pass filtering. The more you turn the Filter knob up to its
maximum clockwise position, the higher the cutoff frequency of the high pass
filter. This means less low frequency response or a greater reduction in bass.
Each time the echoes repeat more filtering is applied to the echo.
8