We love our Macs, but a few of us are not loving that Audition still runs only on Windows. However, with an Intel-based Mac running Leopard and a copy of 32-bit releases of Windows XP or Windows Vista, Boot Camp could be the answer for you. In fact, our team has found that running Audition 3 in Boot Camp is no different than running it in Windows on a laptop or desktop with good hardware specs (For Audition system requirements, please go to: http://www.adobe.com/products/audition/systemreqs/.)
When I want to record multiple tracks of audio with full effects and monitoring, I run Audition using Boot Camp. Audition works smoothly on an Intel Mac because Boot Camp runs Windows natively, just as any PC would. However, when all I want is to make some minor edits, restore some noisy files or perform some batch conversions, I run Audition from OS X using virtualization software from VMWare or Parallels. Virtualization has opened the door to all sorts of new possibilities for our application library making the OS less important as systems get more powerful, CPUs get more cores and memory gets cheaper. Both Parallels Desktop and VMWare Fusion allow you to run Windows sessions without logging out of OS X (you can even use them with a Boot Camp installed partition). And since the VMWare Fusion and Parallels Desktop hardware configuration is customizable, you can adjust the amount of RAM available, which USB or Firewire devices it has access to or several other parameters.
So basically, if you plan to use Audition on an Intel-based Mac for one-track recording, light multitrack mixing, or editing and restoration, both Parallels Desktop and VMWare Fusion will do the job. If you want to record and mix multiple audio tracks, you should run Audition using Boot Camp.