Wood Bass Preamp K&K SOUND System Bass master Rockabilly Puls Dual Channel I don't know how to use it. I bought it new and it produced sound, but I didn't know how to mix, so I've kept it at home unused. Would anyone looking for one be interested? Search terms: Wood bass, contrabass Rockabilly Psychobilly Rustic Slap - Brand: K&K Sound Systems - Model: Bass master Rockabilly Puls Dual Channel - Number of channels: 2 - Adjustment functions: BASS, MID, TREBLE, GAIN - Power supply: 9V battery *Cables etc. that came with the purchase will be included. Please check the photos. *I am selling this on behalf of my family. I don't know much about this product, so I will answer to the best of my ability. *Please state your desired price when negotiating. Please feel free to ask any questions. Thank you for looking.