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Here, have a data point: GCHQ had a sub-1kbps voice codec in the mid-80s (it sounds horribly 'squelchy'), and they used tape when they were doing it back then..

Here, have a data point: GCHQ had a sub-1kbps voice codec in the mid-80s (it sounds horribly 'squelchy'), and they used tape when they were doing it back then...