The rackmount PSA is a powerful combination of dazzling analog SansAmp tones, unlimited editing and dependable digital programmability. The result is a phenomenal pre-amp that can be mercilessly tweaked, while favorite sounds can be stored with the push of a button. Each of the expanded range of eight controls, including usefully defined parameters such as Buzz, Crunch and Punch, has 256 incremental steps for ultra-precise adjustments. Shipped with 49 factory presets and 49 user definable locations, the PSA packs a universe of tone in a single rack space.