SIDalyzer v1.0 by Sven Peterson - Found this nice SID diagnostic tool on the Facebook Commodore 64/128 channel.  Here are some words from the author:

This is the program I wrote last week. It is for setting every register and bit in the SID to test if it is completely working. I have noticed, that some SIDs are partially broken and the C64 Diagnostic SID test sequence didn't really show it. It is also good, if you want to learn about the registers of the SID and try things out. In case, somebody is interested....