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this looks about like the thing..

If you're on Windows, I've seen a few spectrogram skins for Rainmeter that uses whatever audio is being played on the device. For example, there is AudioAnalyzer[0]. Personally, I've been using a skin that shows a simple waveform of the current system audio, but also integrates with Spotify to change the color to match the primary album color. Unfortunately, I don't have the name or link on hand.

0: https://forum.rainmeter.net/viewtopic.php?t=31091

oh sweet! https://forum.rainmeter.net/viewtopic.php?f=27&t=34430#p1701... did the trick :) ty

Run a soundcard loopback into an instance of izotope insight (or similar).