A fixed two-input mono/stereo mixer that sums its inputs into one output. Each input has its own linear level control (Gain 1 and Gain 2), a shared output level runs from -60 dB to +30 dB, and a Max gain range selector (0.001, 0.01, 0.1, 1, 10, 100 or 1000) multiplies the per-input gains, so the same 0-to-1 sliders can span anything from fine attenuation to large boost.
Each input sample is scaled by its channel gain (times the output gain and the selected range factor) and the results are added into the output; the per-channel mute, bypass and invert options fold into those gains. The sum is formed one sample-frame per tick, in keeping with WaveWarp's sample-per-sample engine.