Yamaha’s SessionCake compact amplifier and headphone mixer combo is a perfect solution for musicians on the go who need to rehearse but also keep things quiet. Up to eight musicians can collaborate over a shared personal audio connection, hearing each other’s instruments or vocals through their individual headphones. It comes in two versions: the red SC-01, with a mono input, is tailored for guitar and bass and the blue SC-02 with stereo/mic input is suitable for synthesizers, electronic drums, and microphones. Two AA batteries power SessionCake for up to 10 hours of continuous use. Each device has a 1/8-inch headphone jack and auxiliary inputs for recording with a mobile device or MP3 player or to add effects.