No high frequency loss at any volume. Works with active and passive audio signals.Can be placed anywhere in the signal chain. Improved sweep for ideal volume control, 9v batttery or AC adapter powered. Condition: These are brand new, fresh from the factory. Vision Guitar is an authorized Ernie Ball dealer. The item "Ernie Ball MVP Most Valuable Pedal 6182 Volume Expression Pedal" is in sale since Tuesday, September 17, 2013. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Power Supplies". The seller is "visionguitar" and is located in San Jose, California. This item can be shipped worldwide.