/// <summary>
/// Split and convolve a single channel by ID.
/// </summary>
static void ProcessChannel(int channel)
{
// Select the retain range
Crossover lowCrossover = spatialChannels[channel].Crossover;
lowCrossover.Process(originalSplit[channel]);
originalSplit[channel] = lowCrossover.LowOutput;
// Select the impulse response frequency range
if (rightSplit[channel].Length != blockSize)
{
rightSplit[channel] = new float[blockSize];
}
leftSplit[channel] = lowCrossover.HighOutput;
Array.Copy(leftSplit[channel], rightSplit[channel], blockSize);
spatialChannels[channel].Filter.Process(leftSplit[channel], rightSplit[channel]);
}