This is a favorite among mixers who can't afford UAD. The models the API 512c preamp and a discrete compressor, but when you add the Lindell 254E (a Pultec-style EQ), you can dial in the exact "air" and punch of an Avalon.
The plugin offers several digital-only advantages that enhance the original hardware workflow: Unison™ Technology: When used with Universal Audio Apollo avalon vt-737 plugin free download
There are two main "official" emulations: and Kazrog . While they are paid products, you can get them for free using these methods: This is a favorite among mixers who can't afford UAD