Soundtheory makes exactly one plugin, and that plugin earned the company a place in studios worldwide. Gullfoss is an intelligent equaliser that analyses your audio hundreds of times per second and rebalances it automatically — clarity comes up, mud comes down, and the result sounds less processed than a manual EQ pass. Engineers run it on vocals, buses and full mixes; many leave it on the master as a final polish. There are only a handful of controls, so the learning curve is minutes rather than weeks. Gullfoss runs on Mac and Windows in VST3, AU and AAX formats, and VST Vault delivers both platforms instantly in a single purchase. Try it late in a mix that almost works — then browse the full VST plugins range for the rest.