Electro-Harmonix C9 Modulation Guitar Effect Pedal. Great pedal that I used to record. Mix with Garage Band and you can add some cool keys as a backing track with your guitar.The item "Electro-Harmonix C9 Modulation Guitar Effect Pedal" is in sale since Sunday, December 22, 2019. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Other Guitar Effects Pedals". The seller is "peetem" and is located in Marietta, Georgia. This item can be shipped to United States.