Digital Sound & Music: Concepts, Applications, & Science, Chapter 6, last updated 6/25/2013
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Figure 6.35 Soft synth running as a standalone application
Figure 6.36 Soft synth running in Logic through an Audio Unit instrument wrapper
An alternative to built-in synths or installed plug-ins is to have more than one program
running on your computer, each serving a different function to create the music. An example of
such a configuration would be to use Sonar or Logic as your sequencer, and then use Reason to
provide a wide array of samplers and synthesizers. This setup introduces a new question: How
do the different software programs communicate with each other?
One strategy is to create little software objects that pretend to be MIDI or audio inputs
and outputs on the computer. Instead of linking directly to input and output hardware on the
computer, you use these software objects as virtual cables. That is, the output from the MIDI
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