Sound Parameters – Filter Types
Waldorf Q User’s Manual
94
hear that when you change
LFO Keytrack
or
Filter Keytrack
. Then each voice sounds
with a different Chorus speed or frequency.
•
You have full control over all parameters that make up the Chorus effect over MIDI by
using Control messages.
The Comb filter as Flanger
A Flanger is almost the same as a Chorus. The only difference is that it has a feedback circuitry to
change the depth of the Flanger effect.
☞
To set up the Comb filter to produce a Flanger:
1.
Adjust the filter as described in the Chorus paragraph above.
2.
Turn up
Resonance
to create the typical Flanger sound.
3.
Eventually lower
LFO Speed
to create slow Flanger sweeps.
4.
Select either
Comb
+ or
Comb
- to change the character of the Flanger.
Set up
Cutoff Mod Source
to
Modwheel
to change the Flanger effect manually.
Use the
Filter Envelope
with positive or negative amount to create a “one time sweep” that is
triggered at Note On.
Use
Filter Keytrack
with an amount of
100%
to create really different flangings depending on
the Note you play.
The Comb filter used to simulate a string or a tube
A Comb filter is one of the most basic building blocks of the so-called “Physical Modeling”, which is
an algorithmic description of an acoustic instrument. The Q is definitely not meant to replace a good
physical modeling synthesizer so you shouldn’t expect to get a perfect emulation of any acoustic
instrument like a trumpet or a violin out of the Q. However, the Comb filter enables you to create
abstractions of those sounds that can be played expressively.
To do so, you have to understand that the Comb filter is the part that actually sets the pitch of the
resulting sound, the oscillators or the noise generator are only used to trigger the Comb filter
somehow. When you play with the Comb filter, you can hear that it emphasizes or attenuates certain
frequencies depending on the setting of Cutoff and Resonance.
When you set
Resonance
to a very high value, you will notice that the Comb filter oscillates heavily,
and that’s the key to use it as a tone generator. When you set
Filter Keytrack
to
+100%
, you can
play the Comb filter musically.
Now you need to know how to set up Cutoff. Filter Cutoff is scaled in semitone steps and you only
have to find the Cutoff value where the filter oscillates with standard pitch. The following table gives
you these settings:
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