/usr/lib/pd/extra/jsusfx~/gain.jsfx is in pd-jsusfx 0.3.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | desc:gain testing
slider1:1<0,5,0.01>GAINL
slider2:1<0,5,0.01>GAINR
@init
gg=0
@sample
spl0=spl0*slider1;
spl1=spl1*slider2;
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