0
32
64
96
127
On the next page of the menu you can set the cut-off frequency:
and then the filter bandwidth and resonance (Q-factor):
The resonance is a factor producing an over-loading of the level of the cut-off frequency. When the
resonance-values are high, such over-loading causes the filter to feed back and so generate new har-
monics. The result is typically a "whistle" or "squeak" in the sound, providing it with a more cutting
edge. Filters without resonance are therefore not as flexible as the Sirius-filters.
On page 13 of the menu you can set the Key-tracking. You can activate it at any time with the KEY-
TRACKING-Key on the front panel. The Key-tracking allows you to control the cut-off frequency by
the pitch you are playing on the Keyboard. You can for instance create sounds which become more
brilliant the further up the Keyboard you move. Positive values become more brilliant, negative val-
ues more dull.
Check it out and let your ears and taste decide.
On page 14 of the menu you will find the parameter called VCF-dynamic. The VCF-dynamic allows
you to determine how the filter can be controlled through Touch-sensitivity. When for instance you
enter +63 the sound will turn more brilliant the harder you hit the Keyboard. -63 obviously pro-
duces the opposite effect. You can activate this function with the VCF-DYN- Key on the front panel.
How much the envelope generator influences the filter is controlled on page 15 of the edit menu via the
parameter called Envelope Modulation:
Now we come to the parameters of the waveform envelope. They can be set in two different ways.
You either choose page 16-19 to enter values for attack, decay, sustain and release or you use the
VCF-EG-MACRO control. There you will find 127 different waveform envelopes to control the na-
ture of the sound (waveform). The front panel of the Sirius has diagrams showing the order in which
the various waveform envelopes are placed.
Edit Synt1-Sound
<11> Cutoff: 0
Edit Synt1-Sound
<12> Qfactor: 92
Edit Synt1-Sound
<13> K63
Edit Synt1-Sound
<14> VCF-Dyn:+63
Edit Synt1-Sound
<15> Env-Mod:+19
The Synthesizer
25