just what is a Digital to Analog Converter and what
improvements do you gain from incorporating such a unit?
Music. You get music.
A DAC converts a digital signal to an analog signal. Music is analog.
Without a DAC, you get a signal made up of very high-frequency pulses,
audible to bats.
It still wouldn't be music even to the bats. It only becomes music when you
count the pulses, then use the numbers to generate an analog signal. That's
what a DAC is for.