Double Dragon PCB C21 cap

Treydogg77

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Donor 2011, 2013
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Does anybody know what the C21 on a Double Dragon board does? The game plays fine but its missing the gameplay music. Does this cap have anything to do with the audio?
 
C21 is just a ceramic 104z smoothing cap between a 74ls163 and another 74 logic chip, the board will be fine without it. It just provides better tolerance for power fluctuations.

Missing music on a DD is usually due to the -5v being missing.
 
A bad volume pot is not going to strip off the music but leave the sound effects.
 
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