MP-201 Manual.indd - Moog Music Inc

MP-201 User’s Manual
LFO OFFSET
The LFO OFFSET parameter sets the initial offset of the LFO when a Preset is
called up. If the footpedal is programmed to control the Offset (FPEDAL MODE =
OFFSET), then the initial LFO Offset value will be overridden as soon as the pedal is
moved. When FPEDAL MODE = OFFSET, the actual offset range is specified by the
programmed HEEL and TOE values for the selected Channel.
To understand LFO Offset, it’s helpful to think of it as adding an expression pedal
voltage to your LFO signal; in effect, the LFO signal ‘floats’ on the Offset voltage.
It’s also important to understand that large LFO Offset values can contribute to signal
clipping at the CV output, particularly when the LFO Amount is set very high (don’t
worry - you can’t damage the MP-201). The reason for this is that the output of the
MP-201 cannot exceed 0 – 5V in Unipolar mode, or ±5V in Bipolar mode, and it’s
possible to program the LFO parameters in such a way as to run into these limits. To
illustrate, let’s consider an example using an LFO Triangle wave set to the maximum
Amount while we apply various Offset values (Bipolar mode shown).
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LFO OFFSET = 2048 (0V). The full-scale
LFO signal (10V) floats on the Offset value,
centered at zero volts.
LFO OFFSET = 3072 (+2.5V). The LFO signal
floats on the positive Offset value. The Offset
causes the peak of the LFO to exceed the
+5V limit, resulting in clipping.
LFO OFFSET = 1024 (-2.5V). The LFO signal
floats on the negative Offset value. The Offset
causes the trough of the LFO to exceed the
-5V limit, resulting in clipping.
LFO OFFSET = 0 (-5V). The large negative
Offset causes the trough of the LFO to be
severely clipped.
To avoid clipping, you can either reduce the LFO Amount value, the LFO Offset
value, or both.
PERFORMANCE TIP: Clipping can also be used to create variations
of the Multi-pedal waveforms, such as flat-topped sawtooth and ramp
waves.