comb

This effect is a delay line comb-filter, which is often used in the creation of artificial reverberators. It has the following arguments:

• reverberation time: the T-60 decay time.
• loop time: the size of the comb filter delay line, in seconds

 # use metro to produce an impulse signal
 1 metro
 # the output of comb is the impulse response
 1.5 0.01 comb