YAMAHA SPX90 Digital Sound Processor with pedal and instruction manual. - Brand: YAMAHA - Model: SPX90 - Power switch: Yes - Input adjustment knob: Yes Thank you for viewing. Sound output has been confirmed. It works without any problems, but "Low" is displayed on the screen. Due to being a used item, there are some scratches and signs of use on the exterior. Main features and capabilities: - A legendary multi-effects unit representing the 80s - Equipped with a variety of effects such as reverb, delay, chorus, pitch shift, and compressor - Widely compatible with guitar, vocals, drums, synthesizers, etc. - A vintage digital unit that can reproduce the famous sounds of the time - Highly regarded as studio equipment and still a popular model Accessories: Instruction manual, pedal No box. (Everything in the photos is included) If you would like additional photos of any areas of concern, please feel free to ask. Please understand that this is a used item and make your judgment after confirming the images. Please take a look at the photos and understand that we will not accept any claims or returns. To prevent switching after shipping, we cannot accept returns, so please feel free to ask any questions before purchasing.