From Electro-Harmonix:
The quintessence of tone! This powerful digital multi-effect begins with the flawless polyphonic tracking of the Micro POG. Next is the Stereo Electric Mistress. Creamy stereo flanging and chorus weave and undulate for the richest modulations. Finally, the Holy Grail Plus wraps you in a silken shroud of luxurious reverb. Switch on Shimmer to re-route the effects. Now the Grail reverberates the POGí’s wet signal and the Mistress completes the chain to add lush flanging to the reverb tails. Shimmer also transforms the Grail into a digital delay with the POG in its feedback path for inspiring ascending and descending octave effects.
*Actual unit may have updated graphic