The Duetto Nano Mixer from Palmer is a small-format active mixer which allows two active sources to be mixed to a single amplifier input. In addition to nano mixer, the Duetto can be used as a cable driver, mono merger, and recording preamp. Though input sensitivity and impedance are optimized for electric guitar applications, the unit can also be used with other instruments and devices with line level signals. Due to its low power consumption, the Duetto can be powered by a 9V battery permitting extended operation. A DC input is provided for use with a power adapter.