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Hi h4yn0nnym0u5e, thank you so much for your prompt reply. Your suggestion makes perfect sense, I really miss having work colleagues to chat to about issues like this. The whole museum power is switched off in one go when it closes every night and no-one goes round to turn off the dozens of AV...

I am using a Teensy 4.0 with a Rev D audio shield. This is a museum exhibit that continuously plays one of 19 tracks (.wav files) stored on a 32GB micro SD card plugged into the audio shield, the track is selected by a visitor. There is a small TFT LCD on the other SPI bus and a timer / counter...