RP-Spec
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A spectrogram is a visual representation of the spectrum of frequencies in a sound or other signal as they vary with time.
The RP-Spec spectrogram displays the input and output signal as an FFT Spectrogram, a 30 band (1/3 octave) Bar Spectrogram or a 30 band (1/3 octave) Single line Spectrogram.
RP-Spec has several display modes and is a free RE plug-in for Reason 9.2 (or higher) users.