Propellerhead Reason Spezifikationen PDF herunterladen (Seite 193)

DR. REX LOOP PLAYER

191

Filter Frequency

The Filter Frequency parameter (often referred to as “cutoff”) determines which

area of the frequency spectrum the filter will operate in. For a lowpass filter, the

frequency parameter could be described as governing the “opening” and “clos-

ing” of the filter. If the Filter Freq is set to zero, none or only the very lowest fre-

quencies are heard, if set to maximum, all frequencies in the waveform are heard.

Gradually changing the Filter Frequency produces the classic synthesizer filter

“sweep” sound.

! Note that the Filter Frequency parameter is usually controlled by

the Filter Envelope (see page 191) as well. Changing the Filter Fre-

quency with the Freq slider may therefore not produce the expected

result.

Resonance

The filter resonance parameter affects the character of the filter sound. For low-

pass filters, raising the resonance will emphasize the frequencies around the set

filter frequency. This produces a generally thinner sound, but with a sharper,

more pronounced filter frequency “sweep”. The higher the resonance value, the

more resonant the sound becomes until it produces a whistling or ringing sound.

If you set a high value for the resonance parameter and then vary the filter fre-

quency, this will produce a very distinct sweep, with the ringing sound being

very evident at certain frequencies.

• For the highpass filter, the resonance parameter operates just like for the

lowpass filters.

• When you use the Bandpass or Notch filter, the resonance setting adjusts

the width of the band.

When you raise the resonance, the band where frequencies are let through

(Bandpass), or cut (Notch) will become narrower. Generally, the Notch filter

produces more musical results using low resonance settings.

Envelope Section

Envelope generators are used to control several important sound parameters in

analog synthesizers, such as pitch, volume, filter frequency etc. In a conventional

synthesizer, envelopes govern how these parameters should respond over time

- from the moment a note is struck to the moment it is released. In the Dr.Rex de-

vice however, the envelopes are triggered each time a slice is played back.

There are two envelope generators in the Dr.Rex, one for volume, and one for the

filter frequency (and/or pitch). Both have the standard four parameters; Attack,

Decay, Sustain and Release

! Please refer to the Subtractor chapter for a description of the basic

envelope parameters.

Amplitude Envelope

The Amp Envelope governs how the volume of a slice should change over time,

from the time it is triggered (the slice note starts) until the slice note ends. This

can be used to make a loop more distinct (by having a snappy attack and a short

decay time) or more spaced-out (by raising the attack time).

The Level parameter acts as a general volume control for the loop.

Filter Envelope

The Filter Envelope can be used to control two parameters; filter frequency and

overall loop pitch. By setting up a filter envelope you control how the filter fre-

quency and/or the pitch should change over time for each slice.

The Amount parameter determines to what degree the filter frequency will be af-

fected by the Filter Envelope. The higher the Amount setting, the more pro-

nounced the effect of the envelope on the filter.

✪ Try lowering the Frequency slider and raising Resonance and Enve-

lope Amount to get the most effect of the filter envelope!

1 2 ... 188 189 190 191 192 193 194 195 196 197 198 ... 297 298

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