Fixed an odd sounds problem with SID

Talon2000

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Had a Space Invaders Deluxe that the invader hit sound was very quiet. I checked the LM3900's to no avail, and the caps. Turned out to be a bad resistor R55, or 53 can't tell from the component layout, but it's the 470k coming from pin 3 of K4 it's part of the feedback input voltage divider I believe. Replaced and have full volume once again on that sound.

Posting this so it might help someone else in the future.
 
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