Multicolor Oscilloscope Similar to Traktor or Rekordbox
Would this be possible in Jitter or Max? I’m relatively knowleable in max, but know nothing about Jitter.
Its possible in waveform~ but doesn’t allow for multicolor blending, and also isn’t as detailed.
Don't know Traktor or Rekordbox but this here comes with Max. Just type Oscilloscope in Max'File Browser and you should see the patch.
Making it multi channel should be not that difficult e.g. have look at the help file of jit.graph. Making it multi channel with different colours for each channel might be more ambitious - maybe use multiple instances of jit.graph and let them draw to the same render context respectively use a xfade (e.g. send output of each jit.graph to a jit.gl.texture and crossfade the textures with jit.gl.pix using mix and apply this mixed texture to a jit.gl.gridshape @shape plane).

There is also a jit.gl.graph-object that lives in 3D.
Also the new mc.scope~ object might be of interest for you.
I also found these threads inspiring:
https://cycling74.com/forums/better-scopes-gl-perhaps
https://cycling74.com/forums/xy-oscilloscope-with-jitter