Electro-Harmonix HOLIEST GRAIL, Manual, Page: 3 / 8

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sound. At the lowest setting, the reverb has a grainier quality, while at the
maximum setting the reverb is at its most lush.
Output Mixer Controls
DRY Output Level Slider – Controls the amount of dry signal sent to the
outputs. The dry signal is mixed into both the left and right output channels. At
maximum setting, 100% signal is output.
SPRING Output Level Slider – Controls the amount of spring simulation
effect sent to the outputs. The spring signal is mixed into both the left and right
output channels. A higher setting makes the output “spring-ier.”
REVERB Output Level Slider – Controls the amount of stereo reverb signal
sent to outputs. A higher setting yields more reverb signal.
PRESET Management
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PRESET/FREE MODE Slide Switch– When in Preset Mode, programs can be saved and
loaded. When in Free Mode, all preset capability is disabled and all parameters are derived
from their slider values. (What you see is what you get!) In Free Mode, the Preset A and B
Footswitches have no function.
PRESET BANK Slider – Selects the bank (1-4) to use when saving or loading presets. In
Free Mode, this slider has no function.
PRESET A Footswitch – Tap this footswitch to load Preset A. Hold down the footswitch
for approximately 5 seconds to save a preset to position A.
PRESET B Footswitch – Tap this footswitch to load Preset B. Hold down the footswitch
for approximately 5 seconds to save a preset to position B.
Preset A LED – Lit solid when Preset A is loaded. Blinks when saving to Preset A.
Preset B LED – Lit solid when Preset B is loaded. Blinks when saving to Preset B.
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-BYPASS -
STATUS LED On/Off – If lit, the reverb is active. If not, the unit is in True Bypass.
BYPASS Footswitch – Toggles between processed sound and True Bypass. When the
Holiest Grail is in True Bypass mode, the Input Jack will be connected to the Main Output
Jack so the Bypassed signal will exit through the Main Output Jack. There will be no output
on the Stereo Output Jack when in True Bypass mode.
- Jacks -
INPUT - This ¼” jack is the audio input.
MAIN OUTPUT - This ¼” jack is the Main or left audio output. When the unit is
bypassed, this output contains the true bypass signal.
STEREO OUTPUT - This ¼” jack is the right audio output or silence when in bypass.
EXP. PEDAL INPUT — This ¼” input accepts an Expression Pedal with a TRS connection
or a Control Voltage (Between 0 and 5V) on TS connection. The Exp. Pedal Input controls
the level of signal into the reverb, useful for fades, swells, and other effects.
MIDI IN - Standard 5pin DIN jack, MIDI Input.
MIDI OUT - Standard 5pin DIN jack, MIDI Output.
PWR - This 2.5mm barrel jack supports a 9VDC/500mA external power supply adapter
which is supplied with Holiest Grail.
- PRESET MODE -
When the unit is in Preset Mode, eight presets are available where one can store and recall
their very own personal sound settings. There are four banks each containing two presets.
The Preset Banks, 1 through 4, are selected using the Preset Bank Slider. The Presets, A &
B, within each bank are selected using the Preset Footswitches. Selecting a preset to load
or save requires choosing a combination of the bank slider and one of the preset