Propellerhead Reason Specifications download pdf (Page 128)

MALSTRÖM SYNTHESIZER

126

Filter controls

Each filter contains the following four controls:

D Kbd (keyboard tracking)

By clicking this button so that it is lit, you activate keyboard tracking. If key-

board tracking is activated, the frequency of the filter will change according

to the notes you play on your keyboard. That is, if you play notes higher up on

the keyboard, the filter frequency will increase and vice versa. If keyboard

tracking is deactivated, the filter frequency will remain at a fixed value regard-

less of where on the keyboard you play.

D Env (envelope)

If you click on this button so that it is lit, the cutoff frequency (see below) will

be modulated by the filter envelope. If you leave this deactivated, the Filter

Envelope will have no effect.

D Freq (frequency)

The function of this parameter depends on which filter type you have se-

lected:

With all filter types except AM, it is used for setting the cutoff frequency of

the filter. In the case of the lowpass filter for example, the cutoff frequency

determines the limit above which high frequencies will be cut off. Frequen-

cies below the cutoff frequency will be allowed to pass through. The farther

to the right you turn the knob, the higher the cutoff frequency will be.

If you have selected AM as filter type, this will instead control the frequency

of the signal generated by the filter. The same control range applies though;

the farther to the right you turn the knob the higher the frequency will be.

D Res (resonance)

Again, the function of this parameter depends upon which filter type is se-

lected:

If the selected filter is any other type than AM, it sets the filter characteristic,

or quality. For the lowpass filter for example, raising the filter Res value will

emphasize the frequencies around the set filter frequency. This generally

produces a thinner sound, but with a sharper, more pronounced filter fre-

quency “sweep”. The higher the filter Res value, the more resonant the

sound becomes until it produces a whistling or ringing sound. If you set a

high value for the Res parameter and then vary the filter frequency, this will

produce a very distinct sweep, with the ringing sound being very evident at

certain frequencies.

In the case of the AM filter type though, this control instead regulates the

balance between the original signal and the signal resulting from amplitude

modulation. The farther to the right you turn the knob, the more dominant the

AM signal will be.

The Filter Envelope

This is a standard ADSR envelope with two additional controls; inv and amt.

The filter envelope is common for both filter:A and filter:B, and controls how the

filter frequency should change over time.

Inv (inverse)

This button toggles inversion of the envelope on and off. The Decay segment of

the envelope will for instance normally lower the frequency, but if the envelope is

inverted it will instead raise the frequency.

Amt (amount)

This controls to which extent the filter envelope affects the filters, or rather - the

set filter cutoff frequencies. For example; if the cutoff frequency is set to a cer-

tain value, the filter will already be opened by this amount when you hit a key on

your keyboard. The amount setting then controls how much more the filter will

open from that point. Turn the knob to the right to increase the value.

! For an overall description of the general envelope parameters (At-

tack, Decay, Sustain, Release), please refer to the Subtractor chap-

ter.

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Propellerhead Reason Specifications Page 128

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