The AXiom Phase-Vibe PV-1 is designed to be that ultimate phaser effect. It combines industry standard 4-stage phase shifting (as established by the MXR Phase 90, EHX Small Stone, Boss PH-1r, etc) with the smooth frequency sweep and low distortion of optical phasers. It gives you extended control over the oscillation SPEED, DEPTH, RESonance (internal feedback level) and sweep CENTER frequency, and it features a MIX control that lets you dial in anything from a completely dry signal to a pure vibrato effect (that's the "vibe" part of the Phase-Vibe). The PV-1 sweep speed can be adjusted from 75 milliseconds (i.e. faaasst) to 12.5 seconds (i.e. slooow) and can produce phasing from under 30 Hz (below low-B on a 6-string bass) to over 15 kHz (about as high as the human ear can detect phasing)... and, of course, all your favourite classic settings in between. It also allows you to adjust the oscillation character gradually from square wave, through sinusoidal, to traditional phaser triangular modulation. And the LEVEL control is purposefully designed to double as an input trim, so that even the hottest signals won't overload the circuitry (such as when placed in an amp's effects loop or after overdrive/distortion/gain pedals). In short, the PV-1 was designed to be the most powerful, musical and versatile 100% analog phaser on the market.