27.06.2013 Views

Logic Pro 9 User Manual - Help Library - Apple

Logic Pro 9 User Manual - Help Library - Apple

Logic Pro 9 User Manual - Help Library - Apple

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

• Deviation slider: This display shows the current phase deviation of the Word Clock from<br />

the time code master—in other words, the deviation between audio and MIDI. Varying<br />

time code signals shown in this display indicate how <strong>Logic</strong> <strong>Pro</strong> regulates the sample<br />

rate of the hardware when in MTC Continuous sync mode. Even large time code<br />

variations result in no deviation between audio and MIDI synchronization. Your audio<br />

hardware must be capable of continuously variable sample rates for this to function.<br />

Small deviations between audio and MIDI are unavoidable, because MIDI can (and<br />

should) follow the time code master directly.<br />

Note: The real-time sample rate conversion feature of <strong>Logic</strong> <strong>Pro</strong> allows it to follow an<br />

external MTC signal (MTC Continuous), while maintaining the correct audio playback<br />

pitch and speed. This feature even works when recording in MTC-slave mode.<br />

Audio Sync Status Settings<br />

• Core Audio pop-up menu: This is where you define how your Core Audio hardware is<br />

synchronized to an external time code master.<br />

• MTC Continuous: Audio regions are started in sync, and the sample rate is continuously<br />

regulated to match variations in the time code master signal. Even very long audio<br />

regions stay in sync in this mode.<br />

• MTC Trigger + Auto Speed Detection: Similar to MTC Trigger (see below), but the tempo<br />

of the time code master is constantly monitored while <strong>Logic</strong> <strong>Pro</strong> is open. The next<br />

time you start <strong>Logic</strong> <strong>Pro</strong>, it will use an adapted sample rate. This mode keeps long<br />

regions in better sync with the time code master, although not as closely as MTC<br />

Continuous. It does, however, use a constant sample rate, which is not affected by<br />

variations in the time code master signal.<br />

• MTC Trigger: Audio regions are started in sync, but are then played at a constant<br />

sample rate, regardless of any variations in the time code master signal. <strong>Logic</strong> <strong>Pro</strong><br />

always uses the set nominal sample rate (44.1, 48, 88.2, 96, 192 kHz). This mode is<br />

suitable when it is vital to retain the absolute pitch of a recording. If the speed of the<br />

time code master deviates from the nominal value, you may need to split long audio<br />

regions into shorter sections.<br />

• External or Free: <strong>Logic</strong> <strong>Pro</strong> has no influence on the sample rate. The audio hardware<br />

is responsible for ensuring that the position and sample rate of audio regions match.<br />

This mode is only advisable if you are sure that the Word Clock and time code master<br />

are running in sync—by using an external SMPTE or Word Clock synchronizer, for<br />

example.<br />

• DAE/TDM pop-up menu: This is where you define how your DAE or TDM hardware is<br />

synchronized to an external time code master.<br />

• MTC Continuous: Audio regions are started in sync, and the sample rate is continuously<br />

regulated to match variations in the time code master signal. Even very long audio<br />

regions stay in sync in this mode.<br />

1216 Chapter 43 <strong>Pro</strong>ject Settings in <strong>Logic</strong> <strong>Pro</strong>

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!