[Timo]

I actually have an old oscilloscope, how do you hook it up?

Lissajous figures are generated with a stereo signal only so not sure how to hook it up.

I regularly use the lissajous scope in Wavelab to see if any high frequencies are starting to clip (the display starts to look like a diamond) before the problem becomes audible. HF clipping sounds horrible and saps the dynamic life out of any audio, so I try and avoid it like the plague. Unfortunately many mastering houses these days don't, and their stuff sounds like utter shite. The loudness wars and all that. Tons of commercial stuff (and I'm talking original rips of prime-time pop acts) suffer irreparable damage by over compression which is easily visible on the scope.