Check the listing for details. Markbass Compressore Compressor Bass Pedal. Condition: New. Listed at 299.99 USD. Quality Tube-driven Compression for Your Bass The Markbass Compressore offers studio-grade compression for your bass in both performing and recording environments. At the heart of this compressor pedal lies an ECC81 tube, which Sweetwater bassists and studio engineers widely praise for its warmth. The Compressore gives you complete tweaking freedom over every aspect of your tone with its intuitive control set. You get all the controls found on studio outboard compressors, including a wide-sweeping Ratio knob that delves into limiter territory and Attack and Release controls that customize how quickly the compression is applied and how long it takes to recede. Moreover, the Compression indicator light’s brightness level provides real-time feedback of your compressed signal.