gbc has become my game boy of choice over the last year. a stock gbc usually has a thin sound and a weak bass. prosound mod will add bass and fullness to the sound for when you are recording. if you only have one gb i would make sure to do the added jack as the prosound wont support the level needed for headphones well. its all about recording quality. the only thing that people can complain about the prosounded gbc sound is that there is a highpitched whining sound created buy the screen. it is easily worked around with some eq work.
as far as the stock gbc chip... well it is no less quality then the dmg. the difference in sound comes mostly from the components between the circuits from the chip and the out jack. you are skiping those circuits with the prosound mod so there is less interruption from the chip to the output.
both units have there merits. the gbc is less likely to crash with lsdj and is more compact. with the prosound mod it sounds good and arguably better then the bass heavy dmg. it all depends on what you are doing. the dmg can be muddy with its bass sometimes. with a gbc the sound can be clearer.
Much more clear now. Thanks! 