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Hi
I have not listened to it but if it is making strange noises now and did earlier then it is probably oscillating at high frequencies.
This could well be caused by your construction on the perf board. If the inverting inputs (pin 2 and 7) have too much capacitance to ground then it gives them high gain at high frequencies. Cut (to shorten) the tracks from these 2 pins and you may well find it behaves. I can't see the layout too well but in escence you need to have the MINIMUM amount of copper linked to these pins.
Using adjacent tracks as 'screening' is a BAD idea.
Matt S
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