Comb delay line with linear interpolation which uses a buffer for its internal memory. See also BufCombN which uses no interpolation, and BufCombC which uses cubic interpolation. Cubic interpolation is more computationally expensive than linear, but more accurate.
| buf | 
 Buffer number.  | 
| in | 
 The input signal.  | 
| delaytime | 
 Delay time in seconds.  | 
| decaytime | 
 Time for the echoes to decay by 60 decibels. If this time is negative then the feedback coefficient will be negative, thus emphasizing only odd harmonics at an octave lower.  |