The sixteen inputs and sixteen outputs form a 256 crosspoint matrix. Input and output control points are also provided, for a total of 288 independently controlled and individually ramped gain points. Two forms of gain ramps, exponential and table-driven, are selectable with each gain change command. The duration of both types of ramps is adjustable over a wide range, from milliseconds up to approximately an hour. Ramps always begin at the current gain level and end at the level specified in the gain change command.
Exponential ramps provide classic fade up and fade down curves.
Exponential ramps are time-scaled so that the curve reaches a point within 1 dB of its final value in the time duration specified in the gain change command. Table-driven ramps allow the generation of arbitrary gain curves. Default curves are loaded on power-up, but customs curves can be downloaded. Up curves and down curves are always time-mirrored images of each other using this method. The entire curve in the table is generated in exactly the time duration specified in the gain change command.