Tutorials and Topics - Peabody Computer Music

Tutorial 27Processing:Delay linesA patch for mixing original and delayed signalsThe tutorial patch sends the sound coming into the computer to two places: directly tothe output of the computer and to a tapin~-tapout~ delay pair. You can control how muchsignal you hear from each place for each of the stereo channels, mixing original anddelayed signal in whatever proportion you want.• Turn audio on and send some sound in the input jacks of your computer. Set thenumber box marked “Output Level” to a comfortable listening level. Set the “Left DelayTime” number box to 500 and the “Right Delay Time” to 1000.At this point you don’t hear any delayed signal because the “Direct Level” for eachchannel is set at 1 and the “Delay Level” for each channel is set at 0. The signal is beingdelayed, but you simply don’t hear it because its amplitude is scaled to 0.Direct signal is on full; delayed signal is turned down to 0The hslider in the left part of the Patcher window serves as a balance fader between a“Dry” (all direct) output signal and a “Wet” (fully processed) output signal.• Drag the hslider to the halfway point so that both the direct and delayed signalamplitudes are at 0.5. You hear the original signal in both channels, mixed with a halfseconddelay in the left channel and a one-second delay in the right channel.221