What's the most audio tracks anyone's running happily?

Hi all
I've just re-titled a question I posted this morning :-
Has anyone ANY idea how high we can fly with numbers of audio tracks on 8 core 3 gig with 10 gig of ram? (my spec below)
I expect it's down to hard drive speed (my audio drive is 7200rpm)but I'm about to mix a huge number of stems ..... all made up of 5.1 interleaved files and I'm also using some Kontakt3 & PLAY sample stuff on another drive?
Anyone got any idea how many "ish" are comforably achievable?
I'm looking at using in excess of 12 x 5.1 interleaved on some passes (that's 70 audio tracks) ..... should that still be small fry?
Anyone got any guiding lights of experience?
Many thanks
Dick

dick the flick wrote:
This is really interesting. I've naively been using 256 the whole time. Just finishing a movie score in 5.1 (for the first time away from Logic /TDM combination) ...... and couldn't understand why the PLAY french horns sounded like they'd been badly pitch changed when I added some HD space designer reverb ..... is could that also be a symptom of wrongly set i/o buffer?
I've never worked with Logic and TDM before, so I don't know if that had any bearing on that. I have never heard pitch problems occur due to a low buffer setting, although anythings possible in this world we work in. That sounds more like a sample rate issue to me.
dick the flick wrote:
So dropping everything onto audio also helps. Is that even the case with 10 gig of RAM available? The manual seems to suggest that this buffer is taken outside of Logic's RAM.
Logic can only access 3 to 4 gigs of RAM, total ( I don't know the exact amount... anyone?) You would have to be using PLAY (or other 3rd party inst) as stand alone apps, and pumping the audio back into Logic, to be taking advantage of all that extra RAM you have.
A couple stereo audio files will use WAY less CPU usage than an instance of PLAY loaded with a few sounds. Plus, it's a good healthy practice to get into for archiving. You don't want to go and open this song in 3 years, and find you can't access the PLAY instrument, because the last version made before East West was bought out by Microsoft is no Longer compatible with Logic's latest version... which will probably be 8.1 by then. I'm just saying...
dick the flick wrote:
I follow here with great quote from a movie I scored called "Grand Theft Parsons" (I notice you're in Nashville and it a was a movie about the stealing of Gram Parsons body)...... Al perkins played pedal steel on the score
I've had the pleasure of working with Al a couple of times. I don't get star struck, living here, because I run into famous people frequently. But legendary session musicians, I turn into a babbling idiot...
dick the flick wrote:
.... if running lots of audio with huge track counts ..... set the buffer higher but don't necessarily use the plugin samplers live?
That would be my advice, for sure. I tend to export my software instruments as soon as I know I will no longer be needing to change them in any way. I will export the audio instrument track, save the instrument into a "Presets" folder within the song folder, then remove the instrument, and simply hide the MIDI track. If for any reason, I find I do need to change something, it's easy enough to get back.

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