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6.2.5. Filter modulation
The Envelope can easily be routed to modulate the filter using the
Modulation Matrix [p.7].
Because envelope modulation is so common, there's a dedicated knob for the amount in the
Analog Filter section.
The Env/Velo knob is detented. It lets you choose between a range of negative and positive
values, with 0 found at the center of this range. When at 0, there is no envelope modulation.
Another common control path is for the amount of the envelope modulation to be controlled
by key velocity, so playing harder creates brighter sounds. This amount can be adjusted by
Shift-turning the knob.
On the MiniFreak, the filter cutoff can also be controlled with LFOs, Aftertouch, Velocity,
Cycling Envelope, Modwheel, Macros and Mod Seq and one more important source: the
note played on the keyboard, high or low. If the filter is modulated by the keyboard, it gets
brighter at higher notes, which is common for many acoustic instruments. This is called
keyboard tracking
or
key tracking
.
Key tracking is adjustable; when it's set to 50%, the filter cutoff perfectly tracks the pitch of
the played note. A self-oscillating filter can then follow what you're playing. This is easily set
up in the Modulation Matrix; here's how.
Start with a sound that has only one Oscillator playing, and turn Resonance all the way up.
Verify that you can hear the resonant whistle by itself when you turn the Osc Volume all the
way down. Then go to the Matrix and set Keyboard modulation of Cutoff to about 50, and
fine tune the cutoff frequency to match the OSC frequency.
If the filter sounds out of tune, with the KBD Amount set to 50 on cutoff, in that case it maybe
is time to perform a
cutoff calibration [p.99].
6.3. Developing a feel for the filter
There are only a few controls on the Analog Filter, but they offer so many possibilities: take
some time to really appreciate what the Analog Filter can do, preferably with the Digital
Effects turned off and a fairly simple Osc Type like BasicWaves to start with. The character
of this filter is magical, and easily overlooked with everything else the MiniFreak can do – so
be sure to give it plenty of attention.
43 Arturia - User Manual MiniFreak - The Analog Filter
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