Apple Logic Pro 7 User Manual download pdf (Page 610)

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610 Chapter 19 Synchronization

If the frame rate is correct, you can use this display to adjust the tape speed of the

master machine to the nominal value (the same speed used when the time code was

recorded). Adjust the varipitch control on the master machine, until the vertical yellow

line is centered.

Sample Rate (Hz)

This display shows the deviation of the sample rate from its nominal value.

Bear in mind that some audio hardware will not allow any variation in the sample rate.

Deviation (ms)

This display shows the current phase deviation of the word clock from the time code

master—in other words, the deviation between audio and MIDI.

Varying time code signals shown in this display indicate how Logic regulates the

sample rate of the hardware, when in MTC continuous sync mode. Even large time code

variations result in no deviation between audio and MIDI. Your audio hardware must be

capable of continuously variable sample rates, for this to function.

Small deviations between audio and MIDI are unavoidable, because MIDI can (and

should) follow the time code master directly.

Audio Sync Mode

This is where you define how each individual piece of audio hardware should be

synchronized to an external time code master.

Not all audio hardware can work in every sync mode described below. This is

particularly dependent on whether or not the hardware’s sample rate can be

controlled.

There are two pull-down menus available, for Core Audio and DAE/TDM hardware. Use

one or both, as applicable to the hardware installed on your system.

MTC Continuous

Audio regions are started in sync, and the sample rate is continuously regulated in

accordance with variations in the time code master signal. Even very long audio

regions stay in sync in this mode.

MTC Trigger + Auto Speed Detection

Similar to MTC Trigger (see below), but the Speed Detection constantly monitors the

tempo of the time code master, while Logic is running. The next time you start Logic, it

will use an adapted sample rate.

This mode keeps long regions in better sync with the time code master, although not

as closely as “MTC Continuous”. It does, however, use a constant sample rate, which is

not affected by variations in the time code master signal.

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