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Logic Pro 9 User Manual - Help Library - Apple

Logic Pro 9 User Manual - Help Library - Apple

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• 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 />

• Digital: Similar to External or Free, but the DAE/TDM hardware is also set up to<br />

synchronize to the sample rate of the incoming digital signal.<br />

• SSD/VSD Type: Exactly the same as Digital, but a SMPTE Slave Driver (SSD) or Video<br />

Slave Driver (VSD) is used in addition, to synchronize with the sample and frame rates<br />

used in <strong>Logic</strong> <strong>Pro</strong>. (The SMPTE Slave Driver is a device which synchronizes <strong>Pro</strong> Tools<br />

hardware to incoming time code or Word Clock signals.)<br />

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

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