Up for sale or trade is my Aguilar DB659 Bass Preamp. The manual can be found here: http://www.aguilaramp.com/wp-content/uploads/manual-db-659.pdf Selling price is $650 USD with payment via PayPal and shipping included to the USA or within Canada. Shipping overseas at a premium. Contact me via private message for any further details. As for trades, interested in rackmount preamps, Monique Dovecage, Tube Amps, 4 or 5 string basses. Might be willing to add cash.