ATKUniversalVariableDelay | SoundShockAudio

ATKUniversalVariableDelay is a variable delay effect from Matthieu Brucher’s Audio Toolkit plugin collection. It combines feedforward and feedback delay paths with a sinusoid-based delay time, so it can move beyond basic echoes into vibrato, flanging, and other modulation-style delay effects.

The official SourceForge project hosts a dedicated ATKUniversalVariableDelay folder with version folders for 1.1.0, 1.0.3, and 1.0.2. KVR lists the current product version as 1.1.0 and identifies the plugin as a macOS and Windows virtual effect in VST, VST3, and Audio Unit formats.

This is a practical choice when you want delay movement that is more technical than a simple tempo echo but lighter than a full creative multi-effects delay. The mean delay, delay amplitude, and modulation frequency concept makes it especially relevant for producers testing chorus-like motion, short modulated repeats, and flanger-adjacent effects.

The main caveat is age and compatibility. Plugins4Free user comments mention problems with older Windows XP-era hosts, so modern users should treat it as a specialist legacy Audio Toolkit effect and verify it inside their DAW before relying on it in a session.