One (1 each) Yamaha SPX90 II Digital effects processor. Always kept in the rack and stored in a no smoking studio. This is used for your vocal reverbs or delays. You can also use this if you have a rack mounted guitar effects and you would like to assign the reverbs to the unit. "THIS IS FOR ONE UNIT ONLY". As you can see I have two so i am selling one. I'm lazy to pull it out of the rack hehe. It has no isssues I just dont use it anymore. If you want to buy the whole rack Give me a reasonable offer.