Tourbuss, Using the drawmer tourbuss – Drawmer Tourbuss for Digidesign Venue User Manual

Page 5

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operator’s manual


Using the Drawmer TourBuss

Key Filters Control Description

Using the Drawmer TourBuss

Key is the term used to denote a signal that can trigger (open) a
Gate/Expander. The filters only affect the way TourBuss responds to
the incoming programme material - they do not have any direct effect
on the output signal unless key listen is selected.

The Drawmer TourBuss Plug-In gives extra flexibility by allowing the
Key to be a separate channel in the Venue mixer, and the provision of
variable Low-Pass and High-Pass Filters allows ‘without compromise’
frequency selective gating/expansion. The plug-in can be switched
for either Internal or External Key source and the KEY LISTEN facility
enables monitoring of the filter setting.

Key Filters


31.2Hz to 8kHz

works by attenuating frequencies below the cut-
off frequency selected.


125Hz to 22.6kHz

attenuates frequencies above the selected cut-
off value.
In other words, when both filters are set, it is the
range between the two settings that is allowed
to pass and is the source used to trigger the
gate/expander. The optimum use of these
controls is to momentarily operate the channel
in Key Listen, and tune-into the loudest part of
the trigger source sound.


A meter above the key filter controls provides a
visual representation of the LF and HF controls,
showing the full key filter range from 31.2Hz to
As the LF and HF knobs move so do the
corresponding pointers on the meter. Note that
as one filter gets within one octave of the other it
also pushes that control.

Key Listen

In normal operation, the filter only affects the
way the TourBuss plug-in responds (opens) to
the incoming programme material - it does not
have any direct effect on the output signal, but
when Key listen is enabled, the effect of the
key filter on the programme material is heard at
the output. Normally this is used to monitor the
effect of the filter to assist in tuning into the
specific key source sound(s). The audio signal
is not routed through gate/expander.



In the Int position, this switch causes the gate
to respond to the dynamics of the signal present
at the main signal input socket. In the Ext
position the gate/expander responds to the signal
dynamics of another, independent signal.

Using External Keys
An external audio source may be used to control the
Gate action, making it possible to Gate one channel’s
sound according to the dynamics of another
independent signal. For example, gating a bass guitar
from a kick drum, or where a brass section can be
keyed from the most experienced player; producing
a tighter, more aligned sound.

Assigning an External Key
Using an example of tightening a bass guitar track
from a kick drum:

Access a TourBuss Gate / Expander on the bass
track, and open the plug-in.
Select the Key Source using the button in the
Venue plug-in frame (top centre).

On the Gate/Expander Plug-In use the toggle
switch (in the Key area) to select the External
trigger as the source.
Set the Key Filter LF and HF bands so that the
filter allows the desired frequencies of the kick
drum signal to pass through to the Threshold.
You might wish to audition the filter settings
using the Key Listen toggle.
Finally, adjust the Threshold to a level so that
kick drum signal adequately triggers the Gate
on every kick pulse.