Using Motu DP and Logic Together - More use of all cores on the PPC Quad

Question

Since there's been some talk about how DP uses four cores on the PPC quad lately I thought I might add what I've been doing to take advantage of untapped processing power. If you have DP (I am running 4.5) you can run it alongside Logic Pro and use interapplication midi (built into Logic and DP) to play Logic's instruments from midi tracks in DP. This is fairly easy to set up in the environment.
With all of my audio recorded in DP I can use all my nice AU plugs there and benefit from DP's use of 4 cores - something I can't do with just the "node trick" in Logic. Logic is then just playing the role of audio instrument slave.
I tend not to like or use most of Logic's processing plugs for audio, but they are fine to process Logic's instruments with so this works well.
The exceptions are Space designer and the tape delay which I still use on recorded audio. To use these with audio recorded in DP I use Jack and/or Soundflower to virtually "patch" the audio through Logic and back to DP. I have no idea what this does to latency but who the heck cares with reverb and tape delay?
Of course I have and like DP so this is worth doing in my case.

Answer 1

Jack is more flexible than Soundflower. The latter sets up less output channels that afford you less possibilities. But, both have worked for me.
True that, in the beginning Jack was a little funky to use but that ended when I set up an agregate device driver for core audio.
As a new feature in one of the Tiger updates (I can't remember which one) you can now set up such a so called agregate core audio device and select that as your device driver in both Logic and DP. So for example I use a MOTU 828 as one of my tried-and-true firewire in/out boxes. So I setup an agregate device in core audio with this Motu unit and Jack (called it Motu 828/Jack OS)and then I selected it in Logic and DP. Otherwise I just had to select Jack (and not the MOTU) as my only output device in Logic and then route ALL audio through it just to get it in and out of the MOTU which was a pain since I couldn't have direct acces to my Motu ins and outs in Logic anymore. Jack became the go- between for everything. That was enough to make me give up.
But using the agregate device saved the day. I now see all of my old MOTU ins and outs in Logic and DP plus Jack's virtual ins and outs which I can then use to patch between the programs. This has worked perfectly fine.
Soundflower can be used similarly but you will just have less virtual outs and ins to deal with and you lose the intermediate step that you have in Jack where you connect the virtual ins to the virtual outs at will. It's done automatically. So this can be easier of course. Or, it can allow for less flexibility. Hope this helps.