From Maxon:When Panasonic closed down their BBD production line in the mid 2000's, Maxon had a tall task ahead of them to redesign their legendary AD-9 Analog Delay around a different IC chip. The resultant AD-9 Pro trumps the original version, offering several new features and a decidedly superior tone.The AD-9 Pro provides 450 milliseconds of fat, warm analog delay tone thanks to 4 x custom-made Maxon MC4107D Bucket Brigade IC's. The delay repeats of the AD-9 Pro are filtered using Maxon's proprietary noise reduction circuitry which reduces the aliasing, clock noise and distortion common to analogs. The result is a rounder, smoother delay repeat that doesn't overpower the original note.With a wider dynamic range and max input level of +12 dB, the AD-9 Pro can accept signal from any source. This improved response offers a better balance between low and high frequency ranges, creating a delay tone that is clear and firm while still retaining that characteristic analog warmth. It also allows the Pro to be used in line level effects loops on amplifiers.The AD-9 Pro features a Multi-Head mode controlled by a top-mounted mini switch. This switch activates a midstream delay feedback loop, creating polyrhythmic repeats against the main delay repeat. The Multi-Head mode can create a striking Tape Echo simulation, or it can be used to create ambient reverb effects at shorter delay time settings.Topping off the AD-9 Pro are dual outputs that allow routing of the dry and delayed signals to two separate amps or mixer channels. Both outputs feature Mechanical True Bypass via a 4PDT switch. Specs: 100% Analog Delay with 450 mS delay time Gorgeous, warm, organic delay tone Special filtering on repeats to reduce distortion Multi-Tap switch for "beat-split" effects Capable of Self-oscillation effects Stereo (wet/dry) outputs Works in FX loop or front-end of amp True Bypass Switching