Apple Logic Express 7 - Manual (Page 96)

96 Chapter 17 ES1
2', 4', 8', 16', 32'
These footage values allow you to switch the pitch in octaves. 32 feet is the lowest, and
2 feet, the highest setting. The origin of the term feet to measure octaves, comes from
the measurements of organ pipe lengths.
Wave
Wave allows you to select the waveform of the oscillator, which is responsible for the
basic tone color. You can freely set any pulse width in-between the square wave and
pulse wave symbols. The pulse width can also be modulated in the modulation section
(see the “Router” section, on page 99). Modulating the pulse width with a slowly
cycling LFO, for example, allows periodically mutating, fat bass sounds.
Sub
The sub oscillator delivers square waves (one and two octaves below the frequency of
the main oscillator), as well as a pulse wave (two octaves below the frequency of the
main oscillator). In addition to pure square waves, the waveform switch allows
selections between different mixes, and phase relationships of these waves, resulting in
different sounds. You can also use white noise, or switch the sub oscillator OFF.
Mix
This slider defines the mix relationship between the main and sub oscillator signals.
When the sub oscillator wave is switched to OFF, its output is completely removed from
the mix. As a tip, high resonance values allow the filter to self-oscillate, which can be
useful if you want to use the filter like an oscillator.
Filter Parameters
Drive
This is an input level control for the lowpass filter, which allows you to overdrive the
filter. Its use changes the behavior of the Resonance parameter, and the waveform may
sound distorted.