Adobe AUDITION 1.5 - Manual (Page 63)

55 ADOBE AUDITION 1.5
User Guide
Open Order Determines the order in which Adobe Audition opens a sound card’s playback
(in) and record (out) ports for use in the multitrack environment. This order is relevant
only for older sound cards that don’t support full-duplex capability.
Start Order Determines the order in which Adobe Audition starts a sound card’s playback
(in) and record (out) ports for use in the multitrack environment. This order is relevant
only for older sound cards that don’t support full-duplex capability.
Correct For Drift In Recordings Synchronizes the master audio playback device (generally,
the first Out device listed in the session—the one on Track 1) and the record device of the
waveform being recorded. If the true sample rates on the cards differ enough that the
recording would have drifted out of sync with the original if both were played back at
exactly the same sample rate, then the recording is corrected by resampling to make it the
proper length. This option only works with new record tracks, not with recording on top
of existing waveforms, or punch-ins.
Note: On sound cards that support sample accurate devices (that is, synchronized device
starting, and all devices keyed off of the same clock) you don’t need to select this option. This
option allows for some measure of near sample-accurate synchronization across different
sound cards, or when using with a single sound card that doesn’t use the same clock for
playback and recording (which is common in consumer and other low-end sound cards).
Correct For Start Sync In Recordings Compares the exact true time that the record device
started with the time the master playback device started. If different, the recorded block’s
position is adjusted so the recording starts in perfect sync with the playback. This option
only works with new record tracks, not with recording on top of existing waveforms, or
punch-ins.
If this option is enabled, and you do a loopback test (by connecting the audio Out to the
audio In and recording some ticks) and each recording is still a fixed amount out of sync,
then you can adjust for this by entering this amount (in milliseconds) in the Latency field of
Options > Device Properties for the recording device being used. To compute milliseconds,
look at the difference in samples, multiply by 1000, and then divide by the sample rate. For
instance, if the recording consistently appears 27 samples ahead of the playback, the latency
would be 27 x 1000 / 44,100, or about 0.61 milliseconds. (The reason for the milliseconds
format and not samples is because at various sample rates this latency will be different in
terms of samples, but will be the same in terms of milliseconds.)
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