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MXL reads channel_count (plain integer) to determine grain buffer geometry, defaulting to 1 if absent. The NMOS IS-04 channels array is ignored by MXL. Without channel_count, stereo audio grains were half the required size. Also: MXL only accepts bit_depth 32 or 64 for audio flows. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>