Apple yesterday posted Audio Update version 1.2 on its Web site. The software is for USB Macs running Mac OS 9.

The update includes improved USB audio support for Mac OS 9. It also supports the Harmon Kardon iSub speaker - due to ship in the UK before the end of February – and enhances playback for DVD movies.

Audio Update version 1.2 requires a Mac with a built-in USB port, and is not suitable for Macs with USB support through a PCI card, according to the notes on Apple’s Web site.

The update includes three files: Mac OS ROM 3.2.1, USB Audio Extension 1.0.1, and Apple Audio Extension 1.0.1.