Here's a repair hint from the department of "I think I just fixed the last problem on this machine..!"
Issue: Sound crackles at seemingly random intervals. Speaker occasionally suffers low volume or distorted output. General sound weirdness.
Root cause: Bad soldering or damaged pins on the audio hybrid. (the white 'Acorn Audio' component between the back panel and the mini-podule socket.
Fix: Desolder the audio hybrid. Cut the pins back, but not too far. Solder a turned-pin pin header (e.g. Harwin type) to the pins on the hybrid on the "Acorn Audio" label side. Solder a matching socket to the motherboard. Reinstall the hybrid.
Arc/RPCs, peripherals, RISCOS operating system & ARM kit eg GP2x, BeagleBoard
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