Up for auction is an electro harmonix holy grail max reverb pedal. I did a lot of research before deciding on this pedal and this was my favorite. It has spring, hall, plate and reverse. They all sound great. The hall reverb with the time turned up all the way creates an endless ambient texture. The reverse reverb with the blend all the way up lets you do guitar solos in reverse. The spring reverb sounds very natural. The mode I used the most was the Plate reverb with the time turned to 2 O'clock and the blend knob turned to 9 O'clock. That setting gave me a vintage 1970s super groovy reverb that was just pleasing to the ear. Great pedal! Enjoy!