Darkglass MICROTUBES X Bass Preamp PedalDistorted Bass Tones with Punch and Power The Darkglass Microtubes X bass preamp pedal nails the recipe for powerful distorted bass that maintains low end impact. The key to punchy distorted bass is allowing your mids and highs to provide the harmonic drive, while leaving your low fundamentals firm and undistorted. The Microtubes X pedal achieves this by splitting your signal to two variable filters before the gain stage, so you can shape your own