Feature List:
Up to 16 audio channels per track.

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Audio mixing with unlimited amounts of sub-groups in unlimited subgroup levels (16x16x16... mixing limit)

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Integral audio dsp running 48 kHz (16channels x 32bit) with 64bit normalization safety

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Sox audio processing on all platforms. zs4 will implement a sox front end which seamlessly integrates with native features (in progress)

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Musical time toolbars to allow for time related operations within the context of beats/bars/parts (see musical loop tutorial for an example)