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MF MD HG01 Electric Guitar Month 06-19-18

Electro-Harmonix Classics Holiest Grail Reverb Guitar Effects Pedal

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Product 153333
Product Price $0.00
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Create custom sounds by adjusting the pre-delay and decay time. Feedback, damping, and diffusion controls allow further shaping of the reverb. An inp...Click To Read More About This Product

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Don't Forget

Your quest for the holy grail of reverbs ends here!

Create custom sounds by adjusting the pre-delay and decay time. Feedback, damping, and diffusion controls allow further shaping of the reverb. An input gain control attenuates the incoming signal and a mixer blends the desired amounts of dry input, spring reverb, and hall reverb. Combining the hall and spring reverbs produces incredibly rich sounds.

Includes 8 programmable presets organized into 4 banks. Stomping the footswitch selects the individual preset, with slider control of the bank. Also includes an expression pedal input for realtime control over slider-based parameters. MIDI can be used to control parameters remotely as well as external effects and parameters.

  • Controls include pre-delay, decay time, feedback, damping, and diffusion
  • Input gain control
  • Mixer for blending dry input, spring, and hall reverbs
  • 8 programmable presets in 4 banks
  • Footswitch selects the individual preset, with slider control of the bank
  • Includes expression pedal input for realtime control over slider-based parameters
  • Remote MIDI control of parameters
  • MIDI control of external effects and parameters

Review Snapshot

by PowerReviews

(based on 6 reviews)

Ratings Distribution

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Reviewed by 6 customers

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(1 of 1 customers found this review helpful)



By Yeahyeahyeah.

from Seattle, Washington

If you like wasting hour after hour messing with different knobs to obtain a decent tone, this pedal is for you. Too complicated. Takes forever to perfect a simple reverb. Maybe there are some hidden tones that make it worth it-- or maybe not. Makes a lot of noise that has, more than once, followed me onstage. Its a little embarrassing. I bought this pedal to use with a cello bow on my Les Paul. It created some pretty cool effects, but they took forever to fine tune. I've heard just as awesome cello bow sounds come from the Holy Grail.So, go with the MUCH cheaper Holy Grail. Great, basic reverb tones that are simple to adjust and fine tune.


very nice pedal

By groshman#1800

from dinwiddie, VA

See all my reviews

I like this pedal and I am very picky about my reverb sound. It is not perfect but what ever is? I have owned many tube amps with reverb over the years and this honestly beats everything I ever owned with reverb both in tone and versatility. I bought this out of need and it works much better than I expected. I hardly ever play with out it as it adds so much warmth and depth.It also is so versatile you can get from very subtle to extreme reverb tones from it. I also see no need to use a compressor while using this as it adds some compression too. I get very good david gilmour-esque ambient 3 dimensional tones from this thing. Thats great since I play pink floyd a lot. Sounds very spacey- If you want it to.Hall sounds like a huge auditorium or maybe even a big empty cave- simply awesome/ -- you will probablly have to tweak the presets a bit but they get you real close to where you need to be.You can easily program them too to personal taste. Really though if you buy this you should read the phamplet that comes with it as otherwise it is a little tricky to figure out exactly what each slider does. The controls each have a drastic effect on the sound and some will overpower others if not set right. I wish it was a hundred bucks cheaper, it is a lot for a single stompbox but it has so many good sounds in it I don't doubt buying it at all.

(0 of 1 customers found this review helpful)


Holiest Grail

By Ralazir

from VA, U.S.

I thought I might have been taking a risk when I ordered the Holiest Grail after nearly obsessive research on other reverb pedals. I shouldn't have been worried because this pedal is amazing. The reverb is so customizable and warm sounding. I don't see how I can play without it now since it has really made my tone interesting.(I use a Fender Strat and a humble little Marshall amp).The presets are really fun to play around with, especially since they're easy to switch back and forth to. Personally the echo verb and resonator are my favorite presets. Very unique.The only issue I've had so far is that sometimes I get a swelling feedback if I have certain settings up to high at the same time (mainly the gain and feedback switches obviously) This is especially true when used with the resonator preset. But that's easily taken care of by just laying off of them a bit. Overall I'd say even for the price this pedal is well worth it. Very good if you want over the top spacey and long ambient sounds or short springy tones, it should really accommodate any specific sound one would be looking for.


If god needed reverb he'd stomp the holiest grail

By The StringSlinger

from Saskatoon, Saskatchewan

See all my reviews

I own the holy grail, holier grail, and figured why not own em all. I play alot of shoegaze and post rock and this pedal will never leave my line up. Versatile and top quality. I also have it as an external effect bus when I record with protools cause its stereo if you require it. Midi is dope for that too.


Good idea, bad execution.

By spoonie g

from southeast

See all my reviews

This was a good try by electro harmonix, but the unit I had had horrible input distortion and any clean output volume was nowhere close enough for performance level (and this was in use with a 100-watt Hiwatt head). Also, the reverbs sound horribly digital and fake. They charge waaaay too much for a subpar product. I eventually replaced it with a t.c. electronics m-one, which is eons ahead of this in sound quality and flexibility. Thankfully, I was able to get a full refund. I honestly couldn not get a sound out of it I would use live.


Truly...the Holiest Grail!

By WilliamScent

from TEXAS

See all my reviews

So I needed a reverb for my Vox AC50 which does not have one built in. I love vintage gear, and I wanted a true spring reverb, so I got the Fener 63 Reverb Reissue. (You can read my scathing review of that one if you dare.) Anyway, it didn't work out because those things just don't work - so after much deliberation and pacing and praying to jah and the guitar gods and wondering what to do, I went ahead and got the Holiest Grail. WOW! This thing sounds great and it is so incredibly versatile you just won't believe it! The preset capability is genius, and very easy to use. The pre-delay sounds incredible and the reverb itsef-whew! This thing can pull it off. It's stereo, you can use a volume pedal for reverb swells, it can be so subtle or so over-the-top KABLAM!!I'm blown away by this pedal, and I love it. The other guitar player in my band had the same reaction I did when he finally wrapped his ears around this one. He just kept repeating "this truly is the Holiest Grail!"

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