This floor version of tech 21´s RPM rackmount provides the same detailed tone shaping possibilities for any signal source. It is particularly useful with acoustic, electric and bass guitars, and upright bass, either direct to a mixing console or with an instrument amplifier. The Para Driver DI gives your instrument a natural warmth and presence, as if miking it through a tube pre-amp. The SansAmp circuitry eliminates the harsh, unnatural harmonics of piezo pickups, while the Drive control offers some tasteful edge -- just a little or over-the-top. Version 2 has exactly the same tonality and functionality with the addition of two new features: Rumble Filter and Air. The Rumble Filter removes unwanted sub-sonic frequencies that cause boominess and audible handling noises associated with acoustic guitars.The Air button adds top-end clarity and sparkle to acoustics.