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Nuendo can record multichannel files up to 14 channels: FLAC only supports up to eight channels, WavPack can go up to 256 and beyond.
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Nuendo can record files in 32 bit float: FLAC does not support 32 bit float, WavPack does.
For only these two reason, WavPack is a better lossless format to work within Nuendo. I’m not asking to throw away FLAC support, I’m asking to add WavPack support.