Specifications

Chapter 4: Using SYNC I/O 41
To resolve SYNC I/O to its internal clock:
From Pro Tools:
■ In the SYNC Setup section of the Pro Tools
Session Setup window, select Internal/VSO from
the Clock Reference pop-up menu.
From the front panel:
■ Press the Clock Reference switch to select
INTERNAL/VSO.
From SYNC I/O Setup software utility
(Windows only):
■ Select Internal/VSO from the SYNC I/O Setup
Clock Ref pop-up menu.
Variable Speed Override (VSO)
To fine-tune the speed (and pitch) of Pro Tools
or any device receiving its clock reference from
SYNC I/O, you can varispeed the rate of the
SYNC I/O crystal-referenced internal clock.
VSO is available at any positional reference set-
ting. VSO is not available from the SYNC I/O
front panel controls, but can be controlled di-
rectly from Pro Tools or with SYNC I/O Setup
software utility (Windows only).
To varispeed the SYNC I/O internal clock from
Pro Tools:
1 In the Sync Setup section of the Session Setup
window, make sure the Clock Reference is set to
Internal/VSO.
2 Select the VSO option.
3 Adjust the varispeed value using the on screen
slider.
To varispeed the SYNC I/O internal clock from
SYNC I/O Setup (Windows only):
1 In the SYNC I/O Setup Variable Speed Over-
ride section, select VSO Enabled.
2 Use the sliders to adjust the varispeed values
in semitone or cent increments. The actual out-
put word-clock frequency is shown near the
sliders.
– or –
Enter the value in semitones and cents using the
editable fields. Varispeed range changes with
sample rate, as shown in the following table.
Variable Speed Override controls (Pro Tools)
Variable Speed Override controls (SYNC I/O Setup
software utility, on Windows)
Effective VSO rates
Sample Rate
(kHz)
Rate
Type
Min. (Hz) Max (Hz)
44.1 1x 40000 50500
48
88.2 2x 80000 101000
96
176.4 4x 160000 202000
192