This video covers some improvements made to an MVS multicart in order to resolve PCM sound issues on a couple of MV-1FZ MVS systems. The problem seems to be common to the 120 in 1, 138 in 1 and possibly other carts. Often these carts are poorly manufactured and lack bypass caps and voltage regulator etc.
The end result is both of my 138 in 1 carts are now much much better with many previously dodgy sounding games all sounding 100%. These fixes apply to the 120 in 1 as well.
EDIT 13/02/2015 – I’ve fixed the problem totally today!!! It was 95% better after the work done in this video, but now its 100%
Final fixes here which also apply to the 120 in 1, and 161 in 1:-
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