Is there a way to do "digital phosphor" type of plots for time series data?

[jheinen]

You can also use the shading capabilities of GR:

using WAV
using GR

file = joinpath(dirname(Base.find_package("GR")), "..", "examples", "Monty_Python.wav")
y, fs = WAV.wavread(file)

shade(y, colormap=-GR.COLORMAP_BLUESCALE, ylim=(-1,1))

Could also be read with FileIO, but seems to be buggy (see !307).