Yes, the VoiceMaster Pro is a Class A device. Why? Class A is a type of amplifier design in which you have 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 switch off and on, inevitably resulting in less linear performance.