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Is the ISA 430 MKII a Class A device, and why is that important?

Yes, the 430 MKII is a Class A device. Why? Well, Class A is
a type of amplifier design in which you have a standing DC
current running through your amplifier circuits all the time.
As the signal comes along you vary what you're taking from
that, rather than switching between supplying a positive
current for one half of the waveform and a negative current
for the other half. This results in the ability to represent
audio in a linear (distortion free) manner all the way
through the circuit. Cheaper processors use IC amplifiers
which run close to Class B and don't have the same standing
DC current, which means the transistors inside the chips
switching off and on, inevitably resulting in less linear