Simple patch with csoundapi running an example from the canonical csound manual (#267, fluidOut) and a speedup of the delay changes to the right ear;
...
instr 99

imvol init 4
asigl, asigr fluidOut giengine1 ;add a stereo flanger
adelL linseg 0, p3*.5, 0.02, p3*.5, 0 ;max delay time =20ms
adelR linseg 0.02, p3*.125, 0, p3*.125, 0.02, p3*.125, 0, p3*.125, 0.02, p3*.125, 0, p3*.125, 0.02, p3*.125, 0, p3*.125, 0.02 ;max delay time =20ms <---[changed this]
asigL flanger asigl, adelL, .9
asigR flanger asigr, adelR, .9
outs asigLimvol, asigRimvol
endin

Silly, fun -- might be a usable effect somewhere? (Reminds me of the hardware synthesizer that used to get impossible values in some of its settings.)
weirdstuff.mp3

Copying & pasting here changed some things, '' somehow turned to' .' (or vanished? Anyway, 'p3.5' in the adelL line became p3.5 ) [original setting for the delay time to left ear.]

In the following line, likewise, 'p3.125' is an erroneous copy of 'p3*.125' throughout. That is, I changed this from a delay increasing and decreasing once over a minute, to one doing this four times (8 segments) in that same minute.

Thanks for sharing!

As for the copy & paste, use ``` when pasting code:

instr 99

imvol init 4
asigl, asigr fluidOut giengine1 ;add a stereo flanger
adelL linseg 0, p3.5, 0.02, p3.5, 0 ;max delay time =20ms
adelR linseg 0.02, p3.125, 0, p3.125, 0.02, p3.125, 0, p3.125, 0.02, p3.125, 0, p3.125, 0.02, p3.125, 0, p3.125, 0.02 ;max delay time =20ms <---[changed this]
asigL flanger asigl, adelL, .9
asigR flanger asigr, adelR, .9
outs asigLimvol, asigRimvol
endin```