Drawmer DS301 Руководство по эксплуатации - Страница 10

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Усилитель Drawmer DS301. Drawmer DS301 20 страниц. Dual midi expander gate

high frequency square wave added to its first cycle, in other words a 'click' will be

heard. In cases like these, start with a fast attack time and moderate threshold,

then gradually lengthen the attack time until the audible click just disappears

when the gate opens, or, use the Auto facility which has been designed to

compensate for any difficult or changing programme attack time.

Once the gate envelope has been triggered, The attack cycle will continue to

completion, even if the incoming trigger source is very short. This can be used to

good creative effect by setting a long attack time, and then processing a crash

cymbal or percussive sound, the resulting slow-attack envelope will completely

change the character of the sound making it appear reversed or 'bowed'.

Auto should always be used when in Expand mode and speech is being

processed.

Using Peak: Included in the DS301 is the Peak facility which operates in

conjunction with fast attack times to give a few dBs of gain to the leading edge of

the sound envelope. This was initially designed to enhance percussive sound and

does work particularly well on share and bass drums. The duration of the peak is

very short and so it is usually permissible to set a recording level before Peak is

made active. In theory, this implies that the tape machine may be overloaded very

briefly each time the peak circuit operates, but in practice this is too short to be

audible when using analogue recorders. However, digital recorder should be set

up with the Peak circuit switched on as they are intolerant of overloads.

The effect of Peak with Expander selected can only be noticed as the expander

gain reduction reaches zero, at which point peak produces expected results.

Using Hold: The Hold time control is useful for preventing gate chatter when

using fast release times, especially with low frequency inputs; under these

conditions, a conventional gate set with its fastest attack and release times will

open and close on individual cycles of the input giving rise to a seriously distorted

sound. Under normal circumstances, a Hold time of 50mS is adequate to prevent

this undesirable effect. Although in expand mode a Hold time of 100mS should

be the minimum setting used.

Hold is also instrumental in creating gated reverb or ambience effects. For this

application, it is normal to set fast attack and release times and then use the hold

control to set the length of the reverb burst. The reverb may be provided by

ambience mics in a live room (usually compressed) or may be artificially

generated and gated directly from a suitably amplified drum mic fed into the

external trigger input of the gate.

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