Studio 64 XTC Read Me

Following are some corrections and additions to the Studio 64 XTC Manual:


Syncing to 29.97 Non-drop

The Studio 64 XTC automatically switches it's SMPTE frame rate setting based on received time code. For instance, if the interface is set to 24 fps and 25 fps is received via the SMPTE IN jack, the interface automatically switches its frame rate setting to 25.

One exception is when receiving 29.97 Non-drop. If the Studio 64 XTC is not set to 29.97 ND, receiving this format will cause the unit to switch to 30 ND. This has to do with the Studio 64 XTC (and all interfaces, for that matter) not being able to distinguish between 29.97 ND and 30 ND.

When receiving 29.97 ND, it's very important that the Studio 64 XTC's frame rate setting matches. If it doesn't, sync problems will occur when using Word Clock, Super Clock, or ADAT sync.

The frame rate for the Studio 64 XTC can be set from the front panel or from the SMPTE Window on your Mac or PC. If you intend to frequently use 29.97 ND, you can configure (and save) one of the Studio 64 XTC user programs to use that frame rate.


Monitoring Blackburst and Video Signals

If the Sync Reference mode is set to receive Video, the Video LED is lit constantly when receiving the composite or Blackburst signal. When these signals are not present, the Video LED blinks slowly.


Default Sync Reference Setting

The default Sync Reference mode setting is now ÒInternal.Ó Following is a complete list of the default settings for the factory user programs:

¥ Sync Reference Mode: Internal
¥ SMPTE Frame Rate: 30 Non-Drop
¥ SMPTE Start Time: 00:00:00:00
¥ Freewheel: 10 frames
¥ MTC Source: Computer
¥ Digital Phase Lock: On
¥ Sample Rate: 48 kHz
¥ ADAT Online: On
¥ ADAT ID: 0
¥ ADAT Offset: 00:00:00:00


Digital Phase Lock

If you are not using digital audio hardware or an ADAT, you can disable Digital Phase Lock for faster lock-up when syncing to SMPTE or MTC. This sync option is stored in each user program and can be disabled/enabled from the Program Edit Window of your Mac or PC software. 

When enabled, the Digital Phase Lock option provides the most accurate sync when using Word Clock and Super Clock with digital audio hardware.

NOTE: The Studio 64 XTC still generates Word/Super Clock when ÒDigital Phase LockÓ is disabled. In this mode, audio sync is not as accurate though.

IMPORTANT: Digital Phase Lock must be checked if you are controlling an Alesis ADAT from the Studio 64 XTCÕs ADAT Sync port.

There are, however, a few differences in the way the Studio 64 XTC behaves when Digital Phase Lock is disabled. Specifically, if Digital Phase Lock is off and the Sync Reference mode is set to MTC or MTC/Video...

¥ SMPTE is not sent to the SMPTE OUT jack.
¥ For Mac users, MTC is automatically sent to all MIDI OUT ports, and to networked interfaces, when the MTC Source is the ÒComputer.Ó
