With the release of Tassman 4.1, Applied Acoustics Systems has finished their transition to support Intel-based Mac systems is now over. All of their Professional and Session Series instruments are now available on Mac OS X as Universal Binaries.
The Tassman 4.1 Update includes Intel-based Mac system support, RTAS plug-in on both Mac OS X and [...]

Applied Acoustics Systems has introduced the AAS Modeling Collection. The collection comprises the entire AAS line of products - Tassman 4, Lounge Lizard EP-2, Ultra Analog VA-1 and String Studio VS-1 - at the price of $499.
The AAS instruments are based on the most advanced physical modeling technology available today for unmatched sound quality, feel [...]

Applied Acoustics Systems has updated its entire product line for compatibility with OS X.
Their entire product line: Tassman 4, Lounge Lizard EP-2, Ultra Analog VA-1, and the upcoming String Studio VS-1, is now compatible with Mac OS X 10.4 (Tiger).
An update for registered users is available free of charge from the Applied Acoustics website.