Half-life

Does anyone know how to make a long-jump script?
All the internet forums I've found so far are suspiciously vague on the exact process beyond the bare code involved.
The training course has been frustrating me for several hours now.

Doesn't work.
I've also tried double-tapping jump, releasing crouch as I jump and attempting to hit both duck and jump at the same time, and a few other variations.

Also, whenever I try to do the jump, the game starts glitching out on me.

DwayneA said:

I think you need to pick up the long-jump module in order to do the long jump.

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It's the training course, the module is provided.

DwayneA said:

you won't be able to pick it up in the real game until much later before you enter Xen

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Yes, I am aware, which is why I'm currently working my way through the story-mode. But I'd like to have the ability once I actually reach Xen.