As part of a recent project involving advanced sound cards, Bootlin engineer Miquèl Raynal had to find a way to automate audio hardware loopback testing. In hand, he had a PCI audio device with many external interfaces, each of them featuring an XLR connector. The connectors were wired to analog and digital inputs and outputs. In a regular sound-engineers based company, playing back heavy music through amplifiers and loud speakers is probably the norm, but in order to prevent his colleagues ears from bleeding during his ALSA/DMA debug sessions, he decided to anticipate all human issues and save himself from any whining coming from his nearby colleagues.
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