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Now that both Audio And MIDI tracks support all three record modes. Monitoring should be consistent. When recording "Sound on Sound" does cue monitoring, while "layered" (opaque). and "non-layered" monitors only the input. Two differences remain: (1) when not recording MIDI tracks still monitor both Input and Disk (unless Non-layered is set), and a final special case is that MIDI tracks always monitor input as fallback. the latter ties in with (2) audio tracks can use hardware monitoring.
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