Apple's AU Lab 2.0, a simple audio utility contained in XCode3, can be configured to easily and swiftly bring up Audio Unit instruments that do not have a standalone GUI, and thus require a host.
One at a time, Audio Unit instruments can be configured and saved as AU Lab documents in a directory which AU Lab can then be set to bring up in a dialog upon launch. Once set up, choose the document of a saved instrument, and experience nearly-instantaneous use of that instrument.
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