For those who have replaced capacitors on old Macs, did replacing the capacitors solve audio issues?

I have a Classic and an LC II that have audio issues. There are a lot of squealing noises and static but you can still make out the audio. I believe it is capacitors that filter the audio that have failed, probably the 50V capacitors for sound out and in. That is my theory, because I have not replaced the 50V capacitors yet on my Classic but I replaced 5 other ones with little or no audio improvement yet.