Drawmer Tourbuss for Digidesign Venue User Manual

Page 8

background image


Noise Gate

Key Filters:

As described in Key Filters section.

Noise Gate:


0.0 to -50.0dB

Sets the level below which gating starts to take
place. For normal noise removal applications, it
is usual to set the Threshold as low as is
possible without spurious triggering occurring,
so that none of the desired signal is lost. The
meter to the right clearly shows the threshold
level in response to the actual signal. Note that
the yellow fader corresponds to the level set,
and can be adjusted using the mouse.


100uS to 100mS

Controls the speed that the gate opens. The
fastest Attack time ensures that the gate does
not clip the leading edge of extremely fast signals.


5.0mS to 5 Seconds

Determines the amount of time the gate is held
open after the signal falls below the Threshold.
This helps to prevent spurious re-triggering when
using fast Release times, but is also
instrumental in creating the classic gated reverb
sound which is often applied to drums.

Note: Since the Hold cycle starts as soon as
the Threshold is crossed, the envelope cycle
will complete even if the Key source falls below
the Threshold level before the Attack phase is

The TourBuss noise gate incorporates many impressive features, many pioneered by Drawmer, which are
invaluable to the sound engineer and not found on conventional noise gates:

Variable high-pass and low-pass filters for ‘frequency conscious’ gating.

Comprehensive envelope control, attack, hold, decay and range.

Ultra-fast response time.

‘Key listen’ facility.

‘Traffic light’ display giving clear indication of gate status.

Threshold metering.

These features are based on the industry standard, DS201 Noise Gate manufactured by Drawmer since
1981. Extensive modelling has been applied to give sonic qualities and ease of operation that is as near as
possible to our analogue product.

Noise Gate Control Description


5.0mS to 5.0 Seconds.

Once the signal has fallen below the Threshold
and the Hold time has expired Decay determines
the rate at which the gate closes.


-100 to 0.0 dB

Sets the amount of attenuation applied to the
input signal when the gate is closed, enabling
the gate to be used to remove unwanted signals
entirely, or simply to attenuate signals which are
too loud. When Duck mode of operation is
enabled, the Range control sets the level to which
the signal will be reduced when open (triggered).

Traffic Light Meter

A three led meter is used to show the operation
of the gate. When the red led is lit the gate is
closed, when green the gate is open and when
yellow shows that the gate is closing after the
signal has dropped below the threshold value
(as set by Hold).

Gate/Duck Button

Toggles between normal gating and ducking.
In Gate mode a Key signal above the Threshold
will cause the Gate to open. In Duck mode the
audio passes un-attenuated until the Key signal
exceeds the Threshold. Ducking is mainly for
applications such as voice-overs or the removal
of ‘clicks’ and ‘pops’ using an External Key

Using the Drawmer TourBuss