Specifications
DigiRack Plug-Ins Guide72
more high frequencies are attenuated. The max-
imum value for LPF is Off. This lets the signal 
pass through without limiting the bandwidth of 
the plug-in.
Delay Sets the delay time between the original 
signal and the delayed signal.
Depth Controls the depth of the modulation ap-
plied to the delayed signal.
Rate Controls the rate of modulation of the de-
layed signal.
Feedback Controls the amount of feedback ap-
plied from the output of the delay back into its 
input. It also controls the number of repetitions 
of the delayed signal. Negative feedback settings 
give a more intense “tunnel-like” sound to 
flanging effects. 
Tempo Sync (Pro Tools 6.2 and Higher) Tempo 
Sync provides a direct connection between ses-
sion tempo and plug-in parameters that support 
MIDI Beat Clock. This direct connection lets 
plug-in parameters such as delay, auto-pan, and 
other time-domain effects automatically syn-
chronize to, and follow changes in, session 
tempo. For plug-ins that do not support Tempo 
Sync, the original MIDI Beat Clock window 
(MIDI > MIDI Beat Clock) remains available in 
Pro Tools.
For more information, see “Tempo Sync” on 
page 23. 
Tempo Available in some plug-ins that do not 
support Tempo Sync, Tempo selects the desired 
tempo in beats per minute (bpm). This setting is 
independent of Pro Tools’ tempo. When a spe-
cific Duration is selected (see “Duration” be-
low), moving this control will affect the Delay 
setting. Likewise, the range of both controls will 
be limited to the maximum available delay with 
the currently selected Duration. To enter very 
short or long delays it may be necessary to dese-
lect all Duration buttons.
Meter Use this to enter either simple or com-
pound time signatures. The Meter control de-
faults to a 4/4 time signature.
Duration Specifies a desired delay from a musical 
perspective. Enter the desired delay by selecting 
appropriate note value (whole note, half note, 
quarter note, eight note, or sixteenth note). Se-
lect the Dot or Triplet modifier buttons to dot 
the selected note value or make it a triplet. For 
example, selecting a quarter note and then se-
lecting the dot indicates a dotted quarter note, 
and selecting an eighth note and then selecting 
the triplet indicates a triplet eight note.
Tempo Sync is not available in plug-ins 
with which it would limit functionality. For 
example, for the Virus Indigo and 
IndigoV40 plug-in, use the Pro Tools MIDI 
Beat Clock window (MIDI > MIDI Beat 
Clock). See the Pro Tools Reference Guide 
for more information. 
Use Edit > Identify Beat or Beat Detective to 
determine the tempo. For more information 
about Identify Beat and Beat Detective refer 
to the Pro Tools Reference Guide.
Tempo, Meter, Duration, and Groove controls
Dot modifierTriplet modifier
Duration










