|
4.8 LOW FREQUENCY OSCILLATORS
Low frequency oscillators or LFOs are used to modify synthesis
parameters over time. The affected synthesis parameter is
called the 'LFO destination'. LFOs, like oscillators, have an
output shape and a frequency. LFOs, unlike oscillators, only have
a frequency range of around 0-40 Hz. In AXS there are 2 LFOs
available for every part.
 |
The picture on the left is LFO1. Click on the shape LEDs to
select an LFO output shape. Select an LFO destination by clicking
on one of the destination LEDs. The frequency of the LFO
can be set using the Rate knob. The amount of modulation
caused by the LFO is set using the Amount knob. To force
the LFO to restart its shape for every new note, enable LFO sync
by clicking on the Sync button.
|
 |
LFO2 differs from LFO1 on a few points. First of all the available
shapes are different. LFO2 has a block-, noise-, trisaw- and sine-shape
and a pulsewidth slider to set the pulsewidth or trisaw amount.
LFO2 also has some different destinations (Osc2 pulsewidth and Pitch).
Selecting the shape, sync, rate, amount and destination works like LFO1.
The pulsewidth slider works as OSC1 and OSC2.
|
Here are some notes and tips on using the LFO:
- To quickly disable an LFO, set its destination to 'None'.
- For a wah-wah effect, assign an LFO to 'Filter'. This will
modulate the filter cutoff.
- For a tremelo effect assign an LFO to 'Amplitude'.
- To modulate the pitch of a single oscillator, assign an LFO
to 'Osc1Pitch' or 'Osc2Pitch'. To modulate the pitch of
both oscillators, assign LFO2 to 'Pitch'.
- For exciting strings assign LFOs to Osc1PW and Osc2PW.
- Selecting 'LFO2 Rate' as LFO1 destination will modulate
the frequency of LFO2 around its set value. This is mostly
used for soundeffects.
|