Apple Logic Express 7 - Manual (Page 39)

Chapter 5 Distortion 39
Distortion
This distortion effect simulates the lo-fi dirt generated by a bipolar transistor.
Move the Drive slider up to increasingly saturate the transistor. Generally, the distortion
created by the plug-in tends to increase the signal level, an effect that you can
compensate for with the Output slider. The Tone knob filters the harmonics-laden
distortion signal, delivering a somewhat less grating, softer tone.
The Distortion Eye is watching—it visually represents the Drive and Tone parameter
settings.
Overdrive
The Overdrive effect emulates the distortion of a field-effect transistor (FET). When
saturated, FETs generate warmer sounding distortion than bipolar transistors.
The Drive slider pushes the transistor over the edge and into overdrive. Generally, the
distortion created by the plug-in tends to increase signal levels, an effect that you can
compensate for with the Output slider.
The Tone knob lets you filter the harmonics-laden distortion signal, which delivers an
even warmer sound.
The Distortion effect’s Eye visually represents the settings of the Drive and Tone
parameters.