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Issues addressed include: support for 64-bit native mode; compatibility with 64-bit Audio Unit plug-ins; and improved compatibility with MainStage 1.x documents. Multiple Playback plug-ins in the same group now sync reliably, and there's improved recording when using the Loopback plug-in.
Logic Pro 9.1 requires Mac OS X 10.5.7 or later. For new users the cost is US$499.