is possible to make sound spectrum thing like this (in real-time rendering)?
You might be able to do it with a fourier transform.
Edit:
@OP What you might be interested in is something called a spectrogram, which can be created using the resource above.
its a bit different, but I will try to experiment with it.
For real-time purposes, using AudioAnalyzer:GetSpectrum and somehow visualizing the spectrum on an EditableImage might be your best bet. My FFT library that @x86_architecture linked can work in theory, but it can’t get a full 20-20,000 Hz spectrum in real time because you won’t be able to sample it at the ~40,000 Hz required to get the full audible spectrum.