CAKEWALK PRO AUDIO, User Manual, Page: 471 / 604

15-3
Synchronization
The clock source and the type of synchronization that is used are options
that are stored as part of your project Þles. For example, one of your
projects might be set up to use the internal clock; a second might use the
Audio clock and MIDI Sync with Pro Audio as the master timing source;
and another might use SMPTE/MTC Sync as the clock source.
Many technical support requests concern synchronization problems,
which are among the hardest to diagnose and duplicate over the phone.
If you experience problems, before you call, perform as much
experimentation and gather as much information as possible about what
does and doesnÕt work. The more prepared you are, the more we can
help.
Clock Sources with No External
Devices
When Pro Audio is used alone, or with an external device that does not
have its own clock or timing signal, you use one of two clock sources:
Internal or Audio.
When the clock source is set to Internal, Pro Audio uses the clock built
into the computer or the computerÕs MIDI interface as its timing source.
If your projects contain only MIDI (no audio), this is the most efÞcient
method of playback.
If your projects contain MIDI and audio, or only audio, you should set
the clock source to Audio. This lets the sound card clock determine the
correct speed for audio playback and automatically synchronizes MIDI
playback to match the audio. For more information, see ÒAudio System
ConÞgurationÓ on page 13-2. You cannot use the tempo ratio controls
when using the audio clock, because the audio playback speed is
determined by the audio clock.
When either of these clock sources is used, you can also conÞgure Pro
Audio to drive other MIDI devices using MIDI Synchronization. For
more information, see ÒMIDI SynchronizationÓ on page 15-4.
You can also choose the sync mode as follows:
1. Choose Options-Project, and click the Clock tab.
2. Choose the desired clock source from the Clock list.
3. Click OK.