PX volume control and adjust LOW & HIGH OUTPUT levels toachieve an overall system balance. Minor INPUT GAINadjustments may be necessary to achieve left/right balance or forlouder tapes or compact discs. Setting filter controls at a highboost position may also cause the PRE indicator to flash,necessitating reduction in INPUT GAIN. If LO or HI indicatorsflash, adjust LOW or HIGH OUTPUT level controls accordingly.Technical AssistanceShould you experience a problem with your PX, please contact thedealer that sold you this product. If your dealer is unable to solveyour problem, you may contact the factory customer servicedepartment directly.Phone: (209) 577-4268 Monday-Friday 8am-5pm Pacific timeFax: (209) 577-8548If you need to return this product for repair, please call the factoryfor a return authorization number. We will ask you for informationwhich will include your name, return shipping address, daytimephone number, model and serial number, and a detaileddescription of your problem. A photocopy of your originalpurchase receipt is necessary to determine warranty status andshould also be included. Once we issue you a return authorizationnumber, please write it in a highly visible area on the package.Zapco will not accept any packages that do not have a valid returnauthorization number clearly marked on the outside of thepackage.Send all repairs to:A.R.P.A. of America Corp.Attn: Service Department413 S. Riverside Drive, Suite DModesto, CA 953547