What it does
Multichannel Reverb Built From Scratch
NOTE: THIS DRAWINGBOARD REQUIRES TWO SOUNDCARDS!
Illustrates how to build a multichannel reverb effect using multiple soundcards. In this example, two stereo soundcards are used to create a four-channel effect. Each channel is driven by a processed version of the same mono input, with a different reverberator for each channel. The reverberators are based on comb and allpass filters, with different filter parameters for each channel. Interesting spatial effects are obtained.
Note: the downsampler is used to reduce the CPU consumption, i.e. so that all filters are running at 22050 Hz (instead of 44100 Hz). The effect of downsampling by 2 is essentially inaudible, especially if the audio source has little (or no) spectral content above 11 kHz, as is the case with the "bass.wav" used in this example.
Try experimenting with different filter settings! The structure can easily be extended to generate more outputs (i.e. for more than two soundcards).