How to show FFT Spectrum behind EQ curve like FabFilter Q3?

Reply to How to show FFT Spectrum behind EQ curve like FabFilter Q3? on Sat, 04 Apr 2026 01:59:52 GMT

the red_1 — Sat, 04 Apr 2026 01:59:52 GMT

@David-Healey Thank you, I managed to get the AudioAnalyser working!
I couldn't find "Enable Spectrum Analyser" from right-clicking the EQ (probably because I'm using SVF EQ nodes in scriptnode, not a built-in Parametric EQ). Instead I used this code:

javascriptconst var dsb = Synth.getDisplayBufferSource("Script FX1");

inline function setEqProperties()
{
    local props = {
        "BufferLength": 4096,
        "WindowType": "Blackman Harris",
        "DecibelRange": [-90.0, 18.0],
        "UsePeakDecay": false,
        "UseDecibelScale": true,
        "YGamma": 0.2,
        "Decay": 0.6,
        "UseLogarithmicFreqAxis": true
    };
    
    local dp = dsb.getDisplayBuffer(1);
    dp.setRingBufferProperties(props);
}

setEqProperties();

And FloatingTile JSON:

json{
  "ProcessorId": "Script FX1",
  "Index": 1,
  "FollowWorkspace": false
}

But now I have a new problem:
The AudioAnalyser background is stuck grey and I can't change it:

Setting all colours to #00000000 in property editor → no effect
Tried JSON properties (BGColour, LineColour) → no effect
I want to make the background transparent so it overlays on top of my EQ curve display

Is there any way to customize the AudioAnalyser colours / make it transparent?

Reply to How to show FFT Spectrum behind EQ curve like FabFilter Q3? on Fri, 03 Apr 2026 22:58:42 GMT

David Healey — Fri, 03 Apr 2026 22:58:42 GMT

@the-red_1

Right click on the EQ and enable the spectrum analyser

You can set the properties for it in your script.

    const dsb = Synth.getDisplayBufferSource("parametricEq0");

	inline function setEqProperties()
	{
		local props = {
		  "BufferLength": 4096,
		  "WindowType": "Blackman Harris",
		  "DecibelRange": [-90.0, 18.0],
		  "UsePeakDecay": false,
		  "UseDecibelScale": true,
		  "YGamma": 0.2,
		  "Decay": 0.6,
		  "UseLogarithmicFreqAxis": true
		};
		
		local dp = dsb.getDisplayBuffer(0);
		dp.setRingBufferProperties(props);
	}

Reply to How to show FFT Spectrum behind EQ curve like FabFilter Q3? on Fri, 03 Apr 2026 22:57:26 GMT

HISEnberg — Fri, 03 Apr 2026 22:57:26 GMT

@the-red_1 You need to assign the floating tile to the module, via the ProcessorId. So ProcessorId should be filled with the name of your module. "Index" is for which buffer you want to display.

Example:

"ProcessorId": "Script FX1", // Name of your effect
"Index" : 0, // To display the first FFT

In either case, I think this example should help you somewhat:

https://docs.hise.dev/tutorials/scriptnode/index.html#custom-draggable-eq