Super DuperThe SUPER-DUPER 2-IN-1 has two rather delightful Super Hard-On pedals in one small box, with two switches and LED indicators. Also, in this SUPER-DUPER 2-IN-1 is a Master volume control that lets you use it as an overdrive/distortion with any output volume.
CHANNEL 1: This channel is a conventional Super Hard-On (TM), which I will henceforth refer to as the SHO, in order to reduce potential offense to young ears and sensitive persons. Its gain control is on the far right, and it's LED is yellow. If you are familiar with the SHO, you'll know that it's a very sparkly sounding high input-impedance preamp with incredible headroom, wide-ranging gain (unity to 60 X), and a maximum volume that will knock out your fillings. Channel one has no Master Volume control, but it's cascaded into Channel 2, which does...
CHANNEL 2 AND THE MASTER VOLUME: This channel has the very same circuit as Channel 1, but the bleeder resistor on the output has been replaced with a Master Volume control, which allows the user to turn down the output volume even if the gain is set quite high. The knob on the left is the gain, and the middle knob is the Master Volume, and the LED is red. When both channels are on, or if only Channel 2 is on, the Master Volume is active. If you leave the Master wide open, you have two identical SHO pedals in one box, which are cascaded.
WHAT DOES THIS PEDAL SOUND LIKE? You might wonder just how insane this pedal sounds when you crank up both channels and turn them both on. Well, I'll tell you. I can't get my Les Paul to stop feeding back at any audible volume level on my Marshall when both channels are wide open, and that's with the amp set at 1. I'm happy about that. Of course, this is not the only setting on the pedal. I don't think there's a musician around who wouldn't be happy to have multiple clean boost pedals set to predictable levels available on stage. This pedal gives you a total of four volume levels, ranging, at your choice, anywhere from perfectly clean to ragingly overdriven. Level 1, your guitar is true-bypassed with both channels off. Level 2, you turn on Channel 1. Level 3, you turn off Channel 1 and turn on Channel 2. This is easy because you can put your foot on both switches at once and alternate between the two channels if you want. Level 4, you turn on both channels.
COMMENTS ON THE GAIN CONTROLS: I've taken a lot of flack for the SHO "crackle okay" knob's noise, which people mistakenly interpret in many different ways. I've seen reviews where the user believes that the pot is "cheap" or that it's "old," or "bad." This is not the case. The SHO uses a revolutionary approach to controlling the gain that resets the headroom, gain, and bias of the transistor at the same time, effectively re-designing the circuit for the optimum settings at each volume level. When the knob is not being turned, the unit makes no crackling sounds. It's not a simple volume control. If it were, the SHO wouldn't be so special. The SUPER-DUPER 2-IN-1 (TM) has this same kind of control for each channel. ZVex SUPER-DUPER 2-IN-1 Set Up: