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  4. G5, Logic Pro and Timing issues

  • G5, Logic Pro and Timing issues

    M
    M
    Sorry, this is a little off topic, but I'm desperate - anyone have any idea whether hardware problem could cause MIDI timing issues in Logic Pro. I'm using a dual 2.0 G5, Logic Pro 7.2.3, latest mac os, audio plays back fine but when there is MIDI in the picture the notes get fudged up sort of jammed toether in parts, and I often get a message that logic could not sync up audio and midi basically. I've had this for ages on this machine but as I've only been working on audio mixes lately I have ignored it for quite some time.

    Miklos.
  • H
    H
    hmmm, sounds weird. Are you just using midi in your Audio Instrument tracks, or are you syncing your machine to something.

    How many EXS instances are you running. I find that, although I don't get sync errors, I do get an audio overload if I don't set EXS to use a greater amount of ram buffer and set the hard disck speed to slow, this creates a bigger guffer so you don't get "Overload" errors.

    If you can describe what's going on in greater detail. There really is no reason that your machine should not be able to sync within itself.
  • J
    J
    Hi Miklos

    This sort of behaviour often originates from the audio settings- try going to options in the audio window and toggling the sample rate to another setting then back (if you are using an external audio interface check the sample rate is altered on that in tandem. Check your clock source is set to internal on your audio interface (if you have one) if you are using an external sync source for any reason make sure it's the same sample rate as your session.

    Finally, also in the audio window select "digidesign hardware set-up" (why this is called after such an outmoded piece of software, now owned by an Apple competitor!, is anyones guess) Try changing the I/O buffer to a different value then back again - the purpose being to force a core audio relaunch.

    This can often help with midi and audio sync problems.

    The other thing that can cause the midi to be out of sync with audio is lots of tempo changes coupled with a heavy cpu load.

    Hope some of this helps.

    Julian
  • M
    M
    Thanks everyone for your replies but the answer came on the logic discussions forum at Apple - it turns out that a number of Virtual Instruments don't work properly unless you have the device settings setting "process buffer range" set to "small" - (audio buffer size doesn't matter - except not too small obviously). This fixed the problem.

    Miklos.