Most stereo formats interleave the left and right channels one a one-frame basis meaning the left and right channels alternate in sequence. Some formats clump several left channel samples in sequence followed by the same number of right channel samples. eg Audioworks stereo has 8 left samples, 8 right samples, 8 left samples, etc. The interleaf passed to PlayIt in this case would be 8-1 = 7.
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