11.3

MALSTRÖM SYNTHESIZER312
•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.
• Freq (frequency)
The function of this parameter depends on which filter type you have selected:
With all filter types except AM, it is used for setting the cutoff frequency of the filter. In the case of the lowpass fil-
ter 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.
• Res (resonance)
Again, the function of this parameter depends upon which filter type is selected:
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 frequency “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 nor-
mally 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 ex-
ample; if the cutoff frequency is set to a certain 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 (Attack, Decay, Sustain, Release), please refer
to the Subtractor chapter.