Instruction manual

SYNC HD Guide42
Variable Speed Override (VSO)
To fine-tune the speed (and pitch) of Pro Tools
or any device receiving its clock reference from
the SYNC peripheral, you can varispeed the rate
of the SYNC peripheral’s crystal-referenced in-
ternal clock.
VSO is available at any Positional Reference set-
ting. VSO is not available from the SYNC periph-
eral front panel controls, but can be controlled
directly from Pro Tools or with the SYNC Setup
software utility (Windows only).
To varispeed the SYNC peripheral 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 Use the on-screen slider to adjust the va-
rispeed value in semitones and cents.
From the SYNC Setup software utility
(Windows only):
1 In the Setup Variable Speed Override section,
select VSO Enabled.
2 Use the sliders to adjust the varispeed values
in semitone or cent increments. The actual Word
clock output frequency is shown near the slid-
ers.
– or –
Enter the value in semitones and cents using the
editable fields. Varispeed range changes with
sample rate, as shown in the following table.
The SYNC peripheral will only output rates
within the limits of the current sample rate. If a
varispeed value results in an output frequency
(sample rate) that is below or above the limits
for the current sample rate, the frequency dis-
play turns red.
3 Click Set.
Variable Speed Override controls (Pro Tools)
Variable Speed Override controls (SYNC Setup software
utility)
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