Dude

Dude is a portable battery operated 5 channel audio mixer with mini jack inputs and output. Each channel has a dedicated mute button and up to +20dB gain to boost weak signals and saturate line level signals. It is a monophonic mixer but can drive your headphones and therefore its suitable for small portable rigs or submixes on stage. It runs on four AA batteries (or external power supply) and it is almost as small as its battery pack. Because each channel has enough gain it can be turned into a tone generator by feeding the output back to an input thru a passive eq and other simple circuits.

Features:
5 channel monophonic mixer
up to +20dB (10x) gain knob for each channel
dedicated mute button switch per channel (not click less)
dual mono output for driving headphones
powered by 4x AA battery or external adaptor 9-12VDC