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The daisy chain thing
When powering a Boss ACA (old-style) pedal from a 9v PSA adapter, the LED barely lights up. This is normal and expected behaviour, since the 9 volts fed to the pedal really is too little – it wants 12 volts, remember? But when the power is being provided via a daisy-chain, with other PSA pedals in the chain and signal cables connecting them, the LED suddenly lights up as normal… What happens is that all the pedals in the daisy chain share a common ground, which bypasses the voltage limiting components in the ACA pedal(s), causing the pedal to receive the full 9 volts. This trick works with any power supply where the outputs share a common ground – daisy chain setups, DC Brick etc.