Find Reviews and Compare Prices for:       All ProductsGuitar Effects     5.0 (1)   Add a review Electro-Harmonix XO Holy Grail Plus Reverb Guitar Effects Pedal   Following on the legendary Holy Grail, the Holy Grail Plus redefines performance reverb. A graceful Room Reverb has been added with a multi-function knob that gives you time, damping and modulation control. The amazing Flerb is expanded to give the ... Have a question? Just Ask! Member Reviews Compare Prices Product Spec Send to a friend Category Delay & Reverb Bass Guitar EffectsCompression & SustainDelay & ReverbDesktop & Rack Guitar EffectsDIYEqualization & Tone ShapingFloor Guitar EffectsHarmonizer, Pitch Shifter, Octave Mod.Looper & SamplerModulation, Chorus, Flanging, PhasingMulti Effects PedalsNoise Gate & SuppressorOctave & Ring ModulatorOverdrive, Distortion, Fuzz & BoostPedalboardsPower SuppliesRouter, Signal Path & Pedal TunerVolume & ExpressionWah, Talk Box & Filter--------Suggest a new option Brand Electro-Harmonix AguilarAMT ElectronicsAphexBarberBBEBehringerBlackstarBossCarl MartinCMATMODSCoffin CaseDamage ControlDanelectroDaphonDevi EverDigital MusicDigiTechDNA AnalogicDODDunlopEBSEbtechEffectsPowerSupplies.comElectro-HarmonixEMMAErnie BallEventideFenderFishmanFractal AudioFulltoneGatorGeorge DennisGig-FXGodlykeGoosoniqueworxGuitarPCB.comGuyatoneHaoIbanezISP TechnologiesJacquesJHS pedalsKeeleyKorgKrankLehleLine 6Mad ProfessorMahoneyMalekko Heavy IndustryMarshallMaxonMI EffectsModtone EffectsMorleyMorpheusMPMMusicians GearMXRPearlPedaltrainPigtronixPro CoRadialRed WitchRMCRocktronRoger Linn DesignRolandSabineSanyoSeymour DuncanSKBSnarling Dogs Sonic ResearchSR&DSuhrT-RexTC ElectronicTech 21THDToadWorksVisual SoundVoodoo LabVoxWamplerWhirlwindXotic EffectsZoomZVex--------Suggest a new option Something wrong in this page? Let us know! Related products: More Delay & Reverb Guitar Effects Other Guitar Effects internal use: spec31 spec242 spec583