Audio mixer with 6 inputs. The individual input gains are adjusted via the Parameter Window, as summarised in the following table. Stereo signals have separate gains for left and right channels. Parameter Purpose "Output gain" slider Adjusts the amplitude of the ouput mix. "Max Gain" selection buttons Sets the range for the individual input gain sliders. "Gain 1--6" sliders Adjustments for the individual input gains. For each input, the gain is given by its slider value multiplied by the "Max Gain" range selection. The resultant gain is displayed (in dB) below the respective slider. Each gain can be muted, bypassed, or inverted (i.e. have its sign reversed) via the checkboxes below the respective slider. "Reset" button Restores the settings of all gains to their default values.
All the mixer floating-point arithmetic is performed by multiplying sample values by linear gain factors, then summing across channels. A linear gain factor, denoted G, corresponds to the logarithmic gain specified in dB, denoted GdB, according to the formula: G dB = 20 log10 G. The logarithmic gain is most commonly used in audio since the human hearing response is logarithmic (in terms of perceived amplitude differences).
