How do create a waveform for an entire song at once?

I'm seeing Audio.AnalyserFreqBinCount("music",0) is the count of "bins" but I'm not sure this is what I want. I think I want to loop through the file and get it's overall "peak" for that seek position (not each frequency).

like this:

res.cloudinary.com/cloudinary/image/upload/waveform_post.png

is it possible to loop through the waveform at the sample-level? (doesn't have to be at a high sample rate - I'm thinking 256 slices or so).