Sound Parameters
36
M Manual
VCF Section
M offers an analog lowpass filter with 24dB/Oct and reso-
nance. This is a SSI 2144 Ladder type with saturation. This
filter type dampens frequencies which are higher than the
specified cutoff frequency. Frequencies below this
threshold are hardly affected. To give you an idea of the
extent of damping, consider this: A reduction of 24dB
reduces the original level by approx. 94%. The damping
factor two octaves above the cutoff point reduces the ori-
ginal level by more than 99%, which in most cases means
this portion of the signal is no longer audible. M’s filter also
features a resonance parameter. Resonance in this context
means that a narrow frequency band around the cutoff
point is emphasised. If the resonance is raised to a great
extent, then the filter will begin self-oscillation, i.e. the
filter generates an audible sine wave even when it does not
receive an incoming signal.
The VCF Section Panel Parameters
Cutoff
Determines the cutoff frequency for the low pass filter. All
frequencies above the cutoff frequency are damped. You
can bring more movement into the sound by modulating
the cutoff frequency via the LFOs, the VCF Envelope or the
Keytrack
parameter. At a value of 50 and a
Resonance
value of 80, the filter oscillates with 1046,5 Hz, which is
equal to note C6. Tuning is scaled in semitone steps. When
Keytrack
is set to +63, the filter can be played in a tempe-
red scale with a tolerance of +/- 2 cents within 5 octaves.
Resonance
Determines the amplification of the frequencies around
the cutoff point. Use lower values in the range 0...60 to give
more brilliance to the sound. At higher values of 60...80 the
sound gets the typical filter character with a strong boost
around the cutoff frequency and a loss in the other range.
When the setting is raised to values above 80, the filter
starts to self-oscillate, generating a pure sine wave. This
feature can be used to create solo sounds like the traditio-
nal "moog lead" or analog-style effects and percussion like
electronic toms, kicks, zaps etc.
Summary of Contents for M
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