Apple's wholly-owned audio solutions subsidiary Emagic has released Logic Platinum 5.4 for Mac OS X.

It's available as a free download for Logic Platinum 5 users.

This update introduces support for Apple's System-level Audio Units technology. Audio Units are an OS X standard for handling third-party digital signal processing plug-ins. The move to this standard, rather than Steinberg's well-used VST technologies, has attracted some criticism, as it will require independent developers to build software wraps in order to make existing VST plug-ins work with Emagic's audio solutions.

Plug-in developers Logic Platinum 5.4 supports all Emagic software instruments and plug-ins. To ease the transition to Apple's Audio Units technology, Emagic has also released the Emagic Audio Units Developer Kit, which third-party companies can use to port existing solutions to support Audio Units.

"The Emagic Audio Units Developer Kit has been in high demand as developers have committed themselves to support Audio Units," said Chris Adam, Emagic CEO. "This clearly demonstrates strong support for an open and modern standard, with the goal of providing all users with the most compatibility and flexibility," he adds.

Audio Units offer a cross-manufacturer standard for the support of software instruments and plug-ins, and offer a framework for compatibility with other applications. They handle incoming audio and deliver processed audio back to applications.

X Unit Apple includes several Audio Units in Mac OS X, including a Velocity Engine-optimized reverb and a sample rate converter. The company will release additional Audio Units in the future.

The release comes as more and moreaudio solutions for Mac OS X – such as Cubase SX and Pro Tools – are announced.

In related news, Yamaha has announced its plans to use Emagic's audio solutions to produce the samples used in its keyboard products.

"We have high hopes regarding the further development of Emagic software on the Apple platform," said Yamaha programmer Thomas Berlin.