If using the native "Convert Audio to Keyframes" method, map the Both Channels slider from the "Audio Amplitude" layer to your Layer Opacity using a simple if expression to create "lip flaps" based on volume.
/Applications/Adobe After Effects [Version]/Scripts/ScriptUI Panels Download Free Auto Lip Sync After Effects Plugins
If you need a completely free, external solution, offers an " Animate from Audio " tool. You upload your audio and select a pre-loaded character. If using the native "Convert Audio to Keyframes"
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