Is a SuperClock (256x) output on Sync I/O only achieved by setting the...

Is a SuperClock (256x) output on Sync I/O only achieved by setting the interface to "Internal"?

Given a Base Clock setting of 256, you will get SuperClock out of the Sync I/O Word Clock Output with any choice of Clock Reference setting, not just Internal.
However, keep in mind that SuperClock doesn't "scale" with the 2X and 4X sample rates. For example, if you set the Sync I/O Sample Rate to 88.2 kHz, the SuperClock coming out will remain at the equivalent of a 44.1 kHz sample rate.

Other Popular Articles:
• Since the Word Clock input on Sync I/O only accepts Word Clock (1x), is it possible to connect a Word Clock (1x) source and output a SuperClock (256x) signal to your audio interfaces?
• "Could not complete the Open Session command because: unexpected end of stream encountered while translating Collaboration Information."
• Mbox System Performance and Mac OS 9.2.2
• Why didn't Pro Tools LE 5.2 for Mbox require a serial number when first launching after installation.
• "Digital noise" is emitted from the Mbox when connecting to internet with internal modem of G4.