F-em User Guide
5.6 Common Modulation Sources
Each Operator (O1 to O8), both Sample Oscillators (S1 and S2), the
Noise Generator (N) and also both Filters (F1 and F2) offer the same
modulation source that will be described in detail on the next pages.
Pitch LFO
This low-frequency oscillator (LFO)
is used to modulate the pitch of the
corresponding tone generator,
respective the filter cutoff for Filter
1 and 2 periodically, but you can
freely assign it to other modules as
well. The LFO usually offers the
same or similar waveforms as an
audio oscillator, but it doesn‘t
produce any sound by itself, it
usually oscillates in subsonic
frequencies around 1 Hz, sometimes
slower, sometimes faster.
•
Pitch LFO On/Off
: Click on
this button, to activate/deactivate the corresponding Pitch
LFO.
•
Assign
: Click on the “Assign” button to call up the modulation
assignment for the corresponding LFO. Read more about this
on page 49.
•
Waveform
: Selects the waveform the Pitch LFO generates:
Sine, Triangle, Pulse, Pulse +, Saw down, 4 and 8 steps Up,
Sample & Hold, Noise, Saw Up, 4 and 8 steps down. The actual
waveform is displayed below the waveform button.
•
Mono
: If deactivated, each voice of a sound has its own Pitch
LFO starting at the selected
Start Phase
and running with its
rate. If activated, the sound appears to only have one LFO for
all voices. The first voice of any overlapping notes determines
the start phase and each following voice synchronizes to it.
•
Clock
: Activates or deactivates the synchronization of the
Rate
to the internal clock, that is delivered by the host application.
Please note that this parameter only synchronizes the rate of
the Pitch LFO. If you want to synchronize to the note start, set
Start Phase
accordingly.
•
Rate
: Controls the Pitch LFO rate or speed in Hz when
Clock
is
off. Changes are continuous and
Rate
can be modulated. If
Clock
is activated,
Rate
can be set in musical values, e.g. 1/16.
•
Depth
: A setting of 100% means that the Pitch LFO fully affects
the modulated signal in the positive direction. Lower settings
reduce the strength of the Pitch LFO modulation. Negative
settings produce a modulation in the negative direction.
•
Start Phase
: Controls the phase with which the Pitch LFO
begins its cycle when a note is played. The start position is
shown in the LFO waveform display. A setting of “Free” means,
that the start phase is random.
•
Delay
: Controls the time before the Pitch LFO waveform is
faded in or out. Depending on the setting of
Fade
, it either
causes the Pitch LFO to start with maximum amplitude for the
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