24 input channels, each with -20dB pad, A/B input, gain,
80Hz HPF, 3 band EQ (mid sweep), EQ bypass, 5 aux (2 pre fade, 1 post
fade, 2 switchable pre/post), group routing,
pan, on/off, solo switches, peak LED, 100mm fader.
4 groups with 4 stereo returns, LED meters for L, R, solo, Groups 1-4