JDELAY()

JDELAY

Simple regenerating delay-line + filter.

in RTcmix/insts/jg

quick syntax:

JDELAY(outsk, insk, dur, AMP, DELAYTIME, FEEDBACK, ringdowndur, FILTFREQ, SIGMIX[, inputchan, PAN, prefadesend, dcblock])

CAPITALIZED parameters are pfield-enabled for table or dynamic control (see the maketable or makeconnection scorefile commands). Parameters after the [bracket] are optional and default to 0 unless otherwise noted.

Param Field	Parameter	Units	Dynamic	Optional	Notes
p0	output start time	seconds	no	no
p1	input start time	seconds	no	no
p2	input duration	seconds	no	no
p3	amplitude multiplier	relative multiplier of input signal	yes	no
p4	delay time	seconds	yes	no
p5	delay feedback	regeneration multiplier, 0-1	yes	no
p6	ring-down duration	seconds	no	no
p7	cutoff freq for low-pass filter	Hz, 0 to disable filter	yes	no
p8	wet/dry mix	0: dry, 1: wet	yes	no
p9	input channel number	-	no	yes	default: 0
p10	pan	0-1 stereo; 0.5 is middle	yes	yes	default: 0
p11	pre-fader send	0: no, 1: yes	no	yes	default: no
p12	apply DC blocking filter	0: no, 1: yes	no	yes	default: yes

Parameters labled as Dynamic can receive dynamic updates from a table or real-time control source.

Author: John Gibson, 6/23/99; rev for v4, 7/21/04

JDELAY instantiates a regenerating delay, similar to DELAY.

Usage Notes

The differences between JDELAY and DELAY are:

JDELAY uses interpolating delay line fetch and longer-than-necessary delay line, both of which make it sound less buzzy for audio-range delays
provides a simple low-pass filter (p7, “FILTFREQ”)
provides control over wet/dry mix (p8, “SIGMIX”)
provides a DC blocking filter (p12, “dcblock”). DC bias can affect sounds made with high regeneration setting.
by default the delay is “post-fader,” as before, but there’s a pfield switch (p11, “prefadesend”) to make it “pre-fader.” If pre-fader send is set to 1, sends input signal to delay line with no attenuation. Then p3 (“AMP”) controls the entire note, including delay ring-down.
The point of the ring-down duration parameter (p6, “ringdowndur”) is to let you control how long the delay will sound after the input has stopped. Too short a time, and the sound may be cut off prematurely.

JDELAY can produce mono or stereo output.

Sample Scores

very basic:

   rtsetparams(44100, 1)
   load("JDELAY")

   rtinput("mysound.aif")

    JDELAY(0, 0, 4.3, 1.0, 0.35, 0.7, 5.0, 0, 1)

slightly more advanced:

   rtsetparams(44100, 2)
   load("JDELAY")
   
   rtinput("mysound.aif")
   
   outskip = 0
   inskip = 0
   indur = DUR()
   amp = 1.0
   deltime = 1/cpspch(7.02)
   feedback = .990
   ringdur = 1
   percent_wet = 0.5
   prefadersend = 0  // if 0, sound stops abruptly; else env spans indur + ringdur
   
   env = maketable("line", 1000, 0,0, 1,1, 6,1, 10,0)
   
   cutoff = 4000
   JDELAY(outskip, inskip, indur, amp*env, deltime, feedback, ringdur,
      cutoff, percent_wet, inchan=0, pan=0.5, prefadersend)

SEE ALSO

maketable, COMBIT, DEL1, DELAY PANECHO,