Drawmer DS301 Instrukcja obsługi - Strona 9

Przeglądaj online lub pobierz pdf Instrukcja obsługi dla Wzmacniacz Drawmer DS301. Drawmer DS301 20 stron. Dual midi expander gate

Drukuj stronę

OUTPUT:

This three-way toggle switch allows the expander/gate to be used Normally or be

Bypassed. In its third position, Key Listen, it routes the output of the key filters to

the main output so that their effect can be heard during setup. In this way, the

filters can be easily set so as to pass the greatest amount of the wanted sound.

G.R. METER:

This six segment LED meter shows the amount of gain reduction taking place at

any time. The meters on both channels operate at all times.

STEREO LINK:

In Gate mode, switching Stereo Link On causes both channels to be 'trigger-

linked' where trigger pulses at both channels' key inputs are connected together.

This facility implies that different control settings can be initiated from a single

pulse to create triggered stereo image-shift effects. By setting one channel to

Gate and the other to Duck, stereo pan effects are possible.

In Expander mode, the left hand channel becomes the master for perfect stereo

tracking. The right hand channel indicator LEDs are extinguished to show that the

controls are inoperative.

Note that when Link is switched on, both channels will be set to the same mode

as determined by the setting of the left channel expander/gate button.

APPLICATIONS

The DS301 may be used either with or without MIDI to apply dynamic control to

an audio signal. In traditional gating applications, the DS301 can be regarded as

being functionally similar to the DS201 but with certain valuable enhancements,

not least of which is the option to switch to expander mode. In many noise

removal applications using the DS301 as an expander will produce a more subtle

result on signals at and around the threshold level, particularly if low ratios are

used. One important point to keep in mind is that the Retrig/Ratio rotary control

is dual function depending on wether gate or expander mode is selected. It is very

important to check the setting of this control when switching between modes.

USING THE ENVELOPE CONTROLS

Early gates were either on or off, whereas most modern gates offer some control

over their attack and release characteristics in order that a variety of material

may be processed without undesirable side-effects such as clicking or gating out

slowly decaying sounds. The DS301 offers very comprehensive envelope control

allowing it to accomplish a full range of corrective tasks and enabling it to be used

in creative applications.

Using Attack: The Attack control on the DS301 has a very wide range; at its

fastest, it can open almost instantaneously. Conversely, with signals having a

naturally slow or moderate attack, setting the gate attack time too fast can cause

clicks, particularly if the threshold has to be set high because of excessive

background noise. This is one of the most common misnomers with noise gates,

especially when the audio signal being processed is in the lower frequency (eg

bass guitar, bass drum). With a high threshold, a low frequency sine wave will be

ignored as the signal starts from its zero level point, as this wave climbs towards

its peak, the level will suddenly exceed the threshold setting, at this point a very

fast attack rate will switch the signal through the noise gate with such a steep

(almost vertical) leading edge that the low frequency sound will have a single

-7-