Mac OS X Snow Leopard (10.6) represents the end of a long-running transition of the Mac operating system from 32-bit to 64-bit support. 64-bit computing offers marginal (but measurable) performance improvements, and more importantly the ability to address more RAM — a lot more RAM, currently more than is even physically available in any shipping consumer computer. By contrast, under the current Mac OS, each 32-bit application can access up to 4GB of RAM. A few tools, like Apple’s EXS24 and Native Instruments’ Kontakt samplers, can address greater memory through the use of virtual memory and memory server schemes. But you don’t get native, 64-bit memory – yet.

That should begin to change. Today, Apple quietly released Logic 9.1 and MainStage 2.1, providing 64-bit support. They should be the first of more tools. MOTU confirms they’re working on a 64-bit version of Digital Performer and their plug-ins. (The free Ardour should work, too, in theory – it’s already 64-bit on Linux; sounds like one obstacle may be its UI toolkit on Mac.) Core Audio and Core MIDI have been rewritten as 64-bit-native Cocoa frameworks, with full 64-bit support, as of Snow Leopard. But prior to Apple’s announcement today, you wouldn’t have noticed, outside things like the developer examples and AU Kit host.

Logic Pro, MainStage get 64-bit support [The Loop, a recent Mac blog with a strong music focus]

Of course, today isn’t exactly the dawn of a brave new 64-bit age on the Mac – more like another (important) step in that direction. You’ll still want plug-ins to run in 64-bit mode, or you don’t get to reap the advantages. 32-bit plug-ins will work via a 32-bit Audio Unit Bridge, but that’s not the same as native 64-bit support, and such bridges are likely to require some testing and refinement before they’re ready for prime time. (On Windows, Cakewalk’s BitBridge technology for doing the same thing has gone through a fair bit of iteration and may as a result be more mature.)

There are some gotchas for some users, as noted by Jim in his story: REX file support, ReWire, AKAI file import (bizarrely), and the Vienna Symphonic Library Tool don’t yet work in the 64-bit version of Logic. In short, 64-bit will be terrific, but most users will want to wait a bit before they switch over.

Of course, this makes the number one question for Mac developers at NAMM, when do you anticipate 64-bit support? (I’m sure they’ll love that.)

I’d be remiss if I didn’t note another significant DAW release: DP7 is shipping this week. The Mac-only Digital Performer still has a loyal following, especially among the scoring crowd, some of whom have stuck with DP since the Performer days – one of the Mac’s first sequencers. I have to say, this particular update seems to focus more on bundled effects than core functionality – and, in fairness, because it’s tough to change core features without upsetting the stuff that keeps your users loyal, this isn’t uncommon. But DP has uncommonly rich support for being a Pro Tools HD front end, it’s Mac-savvy and Snow Leopard compatible, and given its popularity in scoring, a little touch like the Marker Counter could be huge news for its major following.

Full disclosure: I haven’t found much reason to touch DP lately, with plenty of other tools to keep my attention, so if there is a loyal DP user who would like to send in their dispatch, I’d love to run it on CDM.

In the meantime, I’ll keep this compact to give you a birds-eye view. First, the effects stuff:

MOTU did not respond to CDM’s inquiry regarding Mac OS X 10.6 – but they have just posted the most interesting update I’ve seen yet. They have drivers ready for their hardware today, and (nearly) full compatibility for their entire product line. They also suggest that 64-bit support is in the works for their applications, which would make MOTU the first audio software developer I’ve heard even breathe a word of discussion of 64-bit. I couldn’t even get a solid commitment to 64-bit from Apple’s Pro Apps folks (though Apple tends not to talk about things until they’re done). The appeal would be clear – MOTU could give their sampling apps access to greater memory.

MOTU has a comprehensive update page, and I’ve added the news to the http://createdigitalmusic.com/snowleopard round-up page.

That said, while MOTU has the greatest level of out-of-the-gate support I’ve seen from any vendor for 10.6, even they have run into a showstopper issue. Their Ethno Instrument isn’t yet compatible; an update is expected. Sure, that’s just one instrument. But the lesson here? If you don’t mind the occasional wrinkle, you can live on the bleeding edge. But if you want to keep your software up and running, your best bet is to be patient and wait to upgrade. That’s not to discourage you from testing the latest-and-greatest, it just means you need to have the expectations to match.

The news remains, though: MOTU does have updated drivers for those of you with MOTU hardware or software who want to get a head start on setting up Snow Leopard.

That does not seem to be the case with other hardware vendors (Pro Tools, M-Audio, Tascam, and PreSonus all suggest waiting), and even some of the drivers that will initially become available should be considered “beta.” That is, they may even be designed to work with 10.6, but could use additional testing. I think that could probably generally be said of this update for musicians – just as with any significant operating system update on any platform.