I have confirmed that sound is coming from all channels. This is a product from 50 years ago, so please check the condition carefully before purchasing. [Product] Roland SYSTEM-100 MODEL-103 Analog Mixer An expansion unit for the SYSTEM-100, which dramatically expanded the range of sound creation in 1975. [Included Items] Power cord (attached to the main unit) [Shipping] ♢♦︎Free Shipping♦︎♢ We will take great care to prevent damage during shipping and will pack it carefully before sending. If you have any other questions or concerns, please feel free to ask in the comments.