Xgrid allows you to use multiple Macs (and/or multiple processors on a single Mac) to speed up processing. iSpeak It uses Xgrid to take the individual sections (defined by splitting the document) and convert them to audio on all available Macs. This helps to process documents faster, which is definitely an asset when trying to convert documents such as entire novels from Project Gutenberg.
Note that iSpeak It need only by installed on your Mac — Xgrid sends all required material when it asks a Mac to do the work.
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