Roland’s GO:MIXER is a compact audio mixer for smartphone video production. Compatible with iOS and Android smartphones, GO:MIXER connects digitally via an included cable, providing clear stereo sound that’s a marked upgrade over using the phone’s built-in mono mic or analog line input. With multiple inputs available, users can connect a mic, musical instruments, and media players, and mix them all together live while they shoot. Offering plug-and-play convenience, GO:MIXER is ready to use out of the box. It’s powered by the smartphone connection, so no batteries are required. And with a compact size that measures just 3.75in. (95mm) square and 1.1in. (28mm) tall, GO:MIXER works for desktop and mobile use. GO:MIXER supports connecting up to five sources at once via inputs for a vocal mic, guitar/bass, stereo keyboard, and two stereo line-level devices (such as music players, drum machines, etc.). Front-panel knobs provide hands-on mixing for the mic and instruments. There’s also a stereo output jack for monitoring the sound via headphones or an external amplification system, plus a dedicated panel knob for adjusting the monitor level.