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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 

Summary of Contents for HOLIEST GRAIL

Page 1: ...rformance and recording the box is able to store 8 user presets and can be remotely controlled via MIDI A standard expression footpedal can be used to control the amount of signal sent to the reverb a...

Page 2: ...imately 1 5 ms From 50 to 100 the time ranges from 100ms to 440ms in 5 ms increments FEEDBACK Slider Controls the amount of feedback that is re circulated in the pre delay before the reverb At its max...

Page 3: ...b signal PRESET Management 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 th...

Page 4: ...t 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...

Page 5: ...nk the preset LED above the footswitch will go off The Preset LED will light only when the Preset Bank slider is pointed to the bank that the current preset resides Changing into Free Mode from Preset...

Page 6: ...e holding the Footswitches apply power to the Holiest Grail 3 Keep holding the Footswitches down After applying power you will see the Preset A and Preset B LEDS blink for about 2 seconds 4 After the...

Page 7: ...Program Change messages to load any of the 8 presets The Holiest Grail receives MIDI Program Change on Channel 1 only Sending any of the following MIDI Messages to the Holiest Grail will load the cor...

Page 8: ...8...

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