About Tiger's improvements for audio:
64-bit audio file support
Tiger improves on the robust audio capabilities of Panther by adding 64-bit audio file support, which effectively removes the 2GB limit on the size of an audio file. This allows a single audio file to contain up to a thousand tracks of PCM or compressed audio in a single file of indeterminate size.
Mac OS X Tiger now allows you to use multiple audio devices together to increase the number of input and output channels. You can combine devices of like sampling rate together, whether via FireWire, PCI or built-in, into a single aggregated device. Set up is easy via Audio MIDI Setup and your new "virtual" device will automatically show up in all applications on the system.
We've had a flurry of compatibility statements since Tiger was unleashed, here's the lot so far:
Current versions of SoundSoap and SoundSoap Pro are Compatible with Mac OS 10.4 - Free Updates Available In May for Tiger-Ready Peak and Deck
Tiger compatible versions of MOTU products are now shipping. In some cases, users may need to download the latest driver package or software update. Complete information about making the transition to Tiger with MOTU products can be found here:
Eleven new drivers have been released to ensure support for Mac OS X 10.4 Tiger. This includes the complete complement of Edirol's current USB audio and audio+MIDI devices, as well as some legacy devices.
Edirol's current OS X MIDI drivers require no update to function fully on Tiger allowing USB MIDI Keyboards, USB MIDI Interfaces, Sound Modules, and Hardware Synthesizers (23 models in all) to function with previously compiled drivers.
The latest Edirol drivers are located here:
If you want to use KORG Legacy Collection with Mac OS X 10.4, you should update to v1.1.4 by applying to updater.
You can download the update files from the "Downloads for Registered Users" page