Ted:
ALD means "assisted listening device". Some folks will claim they have a hearing deficiency, get these devices which are for the hard of hearing and which feed roughly a soundboard-quality feed into an audio output, and they'll then run that output into their recording device. Kind of a backdoor way to get a soundboard-quality (roughly) recording.
RE Matrices, I had the same question...read the thread
here that I started.
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