Because Sonic Circus works with new and used/vintage gear, and has a long standing relationship with API, we often have an excellent selection of previously owned 500 series audio signal processing modules from API and the members of the VPR alliance. Whether the modules are refurbished, or have been swapped out from a Sonic Circus custom configuration, you can be sure they will work flawlessly in your modular chassis or lunchbox. Stay in touch with Sonic Circus for the latest arrivals.