For sale: BOSS BC-1X. Used only at home, but there is some characteristic blurring of the text on this product. Below is the manufacturer's description: ■ The Ultimate Compressor The BC-1X provides natural compression with a core sound, without ever destroying the character of the original sound. With conventional compressors, overtones are a factor, and the fundamental (root note) is similarly compressed, resulting in a loss of the core sound and attack. The BC-1X uses its unique advanced MDP technology to compress the appropriate parts of the sound according to the player's nuances, creating natural compression. It is truly the ultimate compressor, capable of expressing the individuality of the bass itself and various playing styles in any range. - Model Name: BC-1X - Function: Compressor - Knob Types: LEVEL, TONE, THRESHOLD - Power: 9V battery or AC adapter