> For the complete documentation index, see [llms.txt](https://docs.lmms.io/user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lmms.io/user-manual/effects/spectrum-analyzer.md). # Spectrum Analyzer ## Spectrum Analyzer in 1.2 and earlier ![Spectrum Analyzer](https://2675558978-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LRtsae7H2l0Wn3A4biK%2F-LuiU5qVcTiUSnU9D973%2F-LuiUFUpKHXGX13XQHos%2Fimage.png?alt=media\&token=0393053b-5c9e-4b0f-98af-defb4fbd8edc) This plugin visualizes the frequencies present in the signal it monitors. ### Graph * **X axis:** shows frequencies from 20 Hz to 20,000 Hz, divided into [octaves](https://en.wikipedia.org/wiki/Octave_\(electronics\)) (this makes the X axis appear nonlinear). * **Y axis:** shows amplitude from 40 dB to -60 dB (displayed linearly with respect to decibels). ### Buttons * **Linear Spectrum:** toggles linear display of frequencies (rather than by octaves). * **Linear Y axis:** toggles linear display of amplitude (rather than by decibels). ## Spectrum Analyzer in 1.3 and later ![Spectrum Analyzer](https://2675558978-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LRtsae7H2l0Wn3A4biK%2F-MUEGhfKm6TTmvTWMfF3%2F-MUEGpAKQ1AlpFuKEBSt%2Fimage.png?alt=media\&token=97faea9f-7792-4129-b383-c7a5de933e4b) ### Buttons * **Waterfall:** * **Averaging:** enables averaging of display frames. * **Stereo:** enables the display of LR channels independently, with the Left channel represented by Blue and the Right channel by Red. * **Peak hold:** enables a "ghost" line that shows the peaks of the spectrum. * **Pause/Play button:** enables/disables the plugin. * **Snowflake:** freezes plugin display (along with the data displayed). ### Drop-down Menus * **Frequency Range** **:** alters the range of displayed frequencies. * **Amplitude Range** **:** alters the range of displayed amplitude. * **FFT Block Size** **:** alters the frequency resolution of the display (Higher resolutions come at the cost of FPS). * **FFT Window Type** **:** changes algorithm used to remove FFT-related noise. * Blackmann-Harris displays the least noise but has low frequency resolution. * Rectangular displays the most noise but has high frequency resolution. ### Graph * **X axis:** shows frequencies based on the Frequency range drop-down menu. * **Y axis:** shows amplitude based on the Amplitude range drop-down menu. {% hint style="info" %} Clicking in the spectrum/waterfall display adds a ruler/cursor with value readouts. {% endhint %} ### Advanced * **Envelope Res:** alters the resolution of the Peak envelope ("Peak Hold"). * **Spectrum Res:** alters the resolution of the display curve with fill-in color. * **Falloff Factor:** alters the speed at which the peak envelope ("Peak Hold") falls to zero. * **Averaging Weight:** alters how the display curve reacts to new samples. * High value: fast reaction, low jitter reduction. enables real-time spectrogram. * Low value: slow reaction, high jitter reduction. * **Waterfall Height:** alters the time range, or the amount of temporarily stored frames, of displayed frequencies in the Waterfall display. * **Waterfall Gamma:** alters the amount of gamma correction in the Waterfall display. * **Window Overlap:** alters how many times each FFT sample is processed (higher values can help improve FPS). * **Zero Padding:** improves resolution when using a smaller FFT Block size, at the cost of performance.