Delay effect with feedback

Some interesting effects can be obtained by feeding the output of a delay line back into itself and adding that to whatever new sound is coming in. The result is delays of delays, echoes of echoes, etc. As was shown in the discussion of Comb filtering, short delays fed back at a specific rate will have a strong resonance effect on the timbre of a sound.

Sample and hold

The idea of “sample and hold” is to capture the amplitude of a signal at a particular instant in time, and hold it constant for a while. In MSP, the sah~ object allows you to do just that.