http://www.youtube.com/watch?v=M4KX7SkDe4Q
It is also to note that the SID from C64 is a sought-after vintage electronical chip, and some less scrupulous peoples actually cannibalise C64 units to remove the Sid chip and put it into musical electronic effect racksor PC cards..
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http://www.youtube.com/watch?v=lnTh4e0b-ic
http://en.wikipedia.org/wiki/HardSID
In a way it is better the amstrad is not touched by such phenomenon...