To Next Page

To Previous Page

The Synthesizer

The last parameter of the oscillator section is the VCF-drive. It produces an overload of the filter stage

which leads to those wonderfully distorted and aggressive overdrive-sounds. Each filter in the parts of

the Sirius therefore has its own distortion unit - very useful for, for instance, acid bass lines, aggressive

solo sounds etc.

For each of the 7 parts the Sirius has its own multi-mode-filter with controllable cut-off frequencies

and resonance (On the Sirius referred to as Q-factor). The cut-off frequency can be manipulated in a

number of ways. You can do this for instance with the separate envelope waveform generator which

generates sound changes automatically. You can also at any time "tune" the cutoff-frequency in real

time with the CUTOFF-control or assign it to the modulation wheel. Like all sound parameters the fil-

ter can also be controlled from an external Midi device.

The first three Keys in the filter section allow you to select one of the filter types. A low pass filter

(LPF) will only allow the frequencies below the cutoff-frequency to pass through. A high pass filter

(HPF) works the other way round. The frequency curve of the filter is given in dB/octave and de-

scribes how strongly the frequencies are faded in and out before and after the cutoff-point. The 12

dB filter is a milder curve than the steep 24 dB filter and therefore sounds a bit softer. The Key track

option is explained later.

Now choose a filter type with the Keys on the front-panel or use the VALUE/TEMPO-dial.

Edit Synt1-Sound

<9> VCFDrive: 27

Edit Synt1-Sound

<10> VCFTyp:LP24

The Filter-Section:

Q-FACTOR VCF-EG

MACRO

LPF 24 dB

LPF 12 dB

HPF 12 dB

CUTOFF ENV.-MOD

RESONANCE-FILTER

KEY-TRACKING VCF-DYN.

Filter without

resonance

CUTOFF-FREQ.

Q-Factor

Sirius-Filter

with resonance

CUTOFF-FREQ.

Quasimidi Sirius User Manual

Questions and Answers: