Jit.fx.pattern.js
But this is inside the jit.fx.ge.pattern.maxpat inside max... ahah they did it!
Haha I see, probably a leftover from an early version of the helper patch... You can replace [v8 jit.fx.pattern.js] by [jit.fx.ge.pattern] and it seems to work as intended. Or just open the [jit.fx.ge.pattern] help patch and you get a very similar (and working) patch.
