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Title says it all. Is there a good way to see an oscilloscope view of my system sound?

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Maybe combine a VST host with a oscilloscope plugin? – endolith Oct 22 '14 at 16:42
    
Reaper isn't free, but you can use it forever with the nag screen and use its built-in Analysis/gfxscope and Analysis/gfxanalyzer, which are better than most of the standalone software I've tried (which isn't saying much). – endolith Oct 22 '14 at 16:52

Most of actual audio edition programs supports the "oscilloscope mode", I mean, the feature that allows user to see the audio wave format(all of them are limited to 20Hz to 20KHz). Check the Audacity software, there is a specific version for OSX, Windows and Linux that allows you to see the entire audio wave format:

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This doesn't show the waveform in real time like an oscilloscope, and doesn't let you zoom in on higher frequency waves – endolith Oct 20 '14 at 20:37

What about something like Blue Cat's Oscilloscope Multi ?

enter image description here

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Looks great, but in my case I am just idly curious, and not ready to plunk down $50. – Alan H. Jun 25 '12 at 20:29

I haven't found any yet that listen to the system audio channels. You can reroute system with Soundflower, however. For the record here are two more handy OSX oscilloscope (and more) apps:

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