Zoetrope

Here's how to get your Focusrite LiquidMix running again if you're on a Mac OS X Tiger install that was upgraded to Leopard:

Create textfile /private/etc/sysctl.conf and reboot:

kern.sysv.shmmax=536870912
kern.sysv.shmmin=1
kern.sysv.shmmni=128
kern.sysv.shmseg=128
kern.sysv.shmall=131072

My Focusrite would only work on a virgin Leopard install, now it works without a problem on my Tiger→Leopard upgrades too. Courtesy of a very quick support email to Focusrite.

a.k.a. Told you so nr. 2: the Mac Pro performs just as it looks on paper, amazing

I completely agree, having a Mac Pro on your desk is a really good feeling. The thing handles everything I throw at it and then some. I almost always feels much snappier than my MacBook Pro, which is no slouch either compared to the Powerbooks that came before it.

A pitty almost all my audio equipment is flaky on the new Intel architecture. My Focusrite Saffire Pro has some issues, and my Line6 equipment (podXT, podXT Pro) is unusable because it will start to stutter after my Mac Pro returns from sleep.

Don't forget to order a nice Cinema Display to go with it, those Dell displays make your tower look ugly ;-)

Update:

Need rock-solid firewire audio performance? Only one solution: RME Audio equipment. They developed their own firewire chip for exactly that reason. I'm using a Fireface 400 and it's the best audio interface I've ever had. Rock-solid is really an understatement.