Apple Logic Express 7 - Manual (Page 128)

128 Chapter 19 EXSP24
LFO Parameters
LFO 1 EG
This knob allows LFO 1 to be faded out (Decay area) or faded in (Delay area). In the
centered position (which can be set by clicking on the small 0 button), the LFO
intensity is constant.
LFO 1 Rate
This is the frequency of LFO 1. It can be set in note values (left area), or in Hertz (right
area). In the centered position (which can be set by clicking on the small 0 button), the
LFO is halted and generates a constant modulation value at full level (DC = Direct
Current).
This allows you to perform a nice trick: Set up an LFO to modulate, say, Cutoff, with the
modulation wheel controlling the LFO’s intensity. Then set the LFO’s rate to DC. As the
LFO’s modulation intensity is controlled via the modulation wheel, you can now make
use of the modulation wheel to manually open the filter.
Waveform for LFO 1 and LFO 2
These two switches allow the selection of the waveform type used by LFO 1 and LFO 2.
A selection of Triangle, falling and rising Sawtooth, Square up and Square down, a
random stepped waveform, and a smoothed random waveform is available for each
LFO.
LFO 1 is a polyphonic LFO with key synchronization. This means that when LFO 1 is
used, each voice of the EXSP24 has its own discrete LFO. When a note is played, the
LFO corresponding to that voice starts its cycle. This scheme means that the LFO cycles
of each voice played are not synchronous, and operate independently of each other.
This opens up a range of modulation possibilities. As an example—the LFO of one
voice could generate the maximum modulation value, while the LFO assigned to
another voice could output its minimum value. This extremely flexible approach can
result in some very lively modulations.
In contrast, LFO 2 is a monophonic LFO without key synchronization. This means that
LFO 2 runs continuously, and is not restarted by the triggering of a new note. All voices
are modulated by the sole LFO, so the degree of modulation at any given time is the
same for all voices. This results in a rather synthetic-sounding modulation.
Use these different characteristics to tailor the sound to your needs.