A/B demonstrations - Astra A-2A
(rendered with v1.0.3; v1.0.4 is identical audio)

vocal-GLOW-0-25-75.mp3      Same vocal, GLOW at 0 %, 25 % (default) and 75 %.
keys-GLOW-0-25-75.mp3       Same keys, GLOW at 0 %, 25 % and 75 %.
keys-EMPHASIS-0-50-100.mp3  Same keys, EMPHASIS at 0 %, 50 % and 100 %.

Levels are matched. What changes between segments is the control named in the
file, nothing else.

GLOW is the tube colour: second harmonic dominant across the whole range.
EMPHASIS acts on the detector only - it changes what the compressor listens
to, never the output signal directly. It is audible only while the plugin is
actually reducing gain, and mostly on bright material. Turning it up mainly
produces MORE gain reduction on bright material; that is the intended
behaviour, not a tone control.
