--Discontinued--The Submix provides a simple and effective method for summing up to four audio signals into one channel of a 500 series system. Four conveniently located ¼" unbalanced inputs are built into the front panel of the Submix, with separate level controls for each input for easy manipulation. These are equipped with Radial's unique dual-gang AccuState circuit that simultaneously sets the input sensitivity and the gain to maximize signal-to-noise. This enables both instrument and line level signals to easily be interfaced without the need for a typical level reducing pad. This makes the Submix ideally suited for summing keyboards, samplers, drum machines, and any audio playback sources in the studio, managing multiple signals without introducing noise.