SPECTRAL VIEWER

The EMW SPECTRAL VIEWER module splits the audio frequency band and translates the individual bands into intensity color levels in a way that red represents low frequencies, green represents the mid frequencies and blue the high frequencies. A full audio material fed into the module will be translated into a dynamically multi-color visualization of the audio spectrum."
The EMW SPECTRAL VIEWER will add an extra dimension, with sound-activated dynamic colors to your modular.

https://www.electronicmusicworks.com/eurorack/spectral-viewer.html