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Plugin UI Scale

Plugin UI Scale module

The Plugin UI Scale module connects to the host control Plugin/UIScale — the zoom factor applied to your exported VST3 / AU plugin’s window. Use it to let the user resize the plugin GUI at runtime, as described in the Resizable Plugin Windows guide.

Found in the Module Browser under Special.

Pins

Section titled “Pins”
PinTypeDescription
UI ScaleFloatThe window scale factor — 1.0 is 100%. Carries values in both directions: read it for the current size, write to it to resize the window.

Usage

Section titled “Usage”

The plugin window’s physical size is the panel size you designed × this scale factor × the system/host DPI factor. The panel isn’t re-laid-out at the new size, it’s zoomed — so the layout can’t break, and everything redraws crisply.

The scale factor is a private host control. It never appears in the DAW’s automation list, and it is not stored in presets — every fresh plugin instance opens at 100%.

Typically driven by a drop-down of fixed sizes (50%, 75%, 100%, 150%, 200%). See Resizable Plugin Windows for the full patch.