[. . . ] * When battery power becomes low, the sound will become distorted or the reverb will not function properly. When these symptoms appear, replace the battery with a new one as soon as possible. [. . . ] In order to obtain the maximum performance and enjoyment from your ST9, we urge you to read this Owner's Manual thoroughly before using. Please keep this Owner's Manual in a safe place for later reference. Your ST9 will give you years of reliable service if you follow the simple rules given below: Do not expose it to the following conditions to avoid deformation, discoloration, or more serious damage. Using the strap You can use the supplied strap to hang the ST9 from your belt or belt loop. To avoid damage to the Personal Studio and other devices to which it is connected (a sound Power Switch (OFF/ON/ECHO) / Indicator q system, for example), turn the power switches of all related devices OFF prior to connecting This is the device's power switch. When set to the "ON" position, the power is switched or disconnecting audio cables. Never apply excessive force to the controls, connectors or other parts. NOTE: This product has been tested and found to comply with the requirements listed in Compliance with these requirements provides a reasonable level of assurance that your use of this product in a residential environment will not result in harmful interference with other electronic devices. This equipment generates/uses radio frequencies and, if not installed and used according to the instructions found in the user's manual, may cause interference harmful to the operation of other electronic devices. Compliance with FCC regulations does not guarantee that interference will not occur in all installations. If this product is found to be the source of interference, which can be determined by turning the unit "OFF" and "ON", please try to eliminate the problem by using one of the following measures: Relocate either this product or the device that is being affected by the interference. Utilize power outlets that are on different branch (circuit breaker or fuse) circuits or install AC line filter/s. If these corrective measures do not produce satisfactory results, please contact the local retailer authorized to distribute this type of product. If you cannot locate the appropriate retailer, please contact Yamaha Corporation of America, Electronic Service Division, 6600 Orangethorpe Ave, Buena Park, CA 90620 The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries. [. . . ] If these corrective measures do not produce satisfactory results, please contact the local retailer authorized to distribute this type of product. If you cannot locate the appropriate retailer, please contact Yamaha Corporation of America, Electronic Service Division, 6600 Orangethorpe Ave, Buena Park, CA 90620 The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries. [. . . ]