Apple Soundtrack Pro User Manual download pdf (Page 207)

Chapter 9 Working With Audio Effects 207

Stereo Spread

The Stereo Spread plug-in is a useful effect for sound design or audio clean-up. It

enhances the perception of stereo by extending the stereo base. Some stereo

enhancing algorithms function by changing the phase of the signal, which can distort

your mix and produce unpredictable results. Instead, the Stereo Spread plug-in extends

the stereo base by distributing a selectable number of bands in the middle frequency

range alternately left and right. This increases the perception of stereo without causing

unnatural-sounding distortion of the mix.

The main parameters of the Stereo Spread plug-in are Order, Upper Intensity (Upper Int.),

and Lower Intensity (Lower Int.). The Order parameter determines number of frequency

bands into which the signal is divided. The Upper Intensity parameter controls the

intensity of the base extension of the upper frequency bands. The Lower Intensity

parameter controls the intensity of the base extension of the lower frequency bands.

Human beings perceive stereo placement of sounds mainly in the middle and high

frequencies. If very low frequencies are distributed between the left and right speakers,

the energy distribution for both speakers will be significantly worse. Therefore, it is

always best to select a lower intensity setting for the lower frequency bands, and avoid

setting the Lower Freq. below 300 Hz.

Working With Realtime Effects

You can add realtime effects to a track, bus, or output in a multitrack project, or to an

audio file project, and then adjust the effect parameters to control the way in which

the effects alter the sound of the track or project.

Working in the Effects Tab

The Effects tab is where you add realtime effects and adjust realtime effect parameters.

When you click the Effects button in the header of a track, bus, output, or in the

Waveform Editor, the Effects tab becomes active and displays the current effects

settings for the track, bus, output, or project.

The upper part of the Effects tab contains lists of available effect categories. When you

click an item in the Category list, the available effects in that category appear in the

Effect list, where you can select and add them to the current effects chain.

The lower part of the Effects tab shows the effects and sends in the current effects

chain. You can show and edit effect and send parameters in the Effect Parameters area.

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Apple Soundtrack Pro User Manual Page 207