I would use a microphone to capture the different renditions and compare them using Audacity or some other similar tool. Here's one place to start: https://for

I would use a microphone to capture the different renditions and compare them using Audacity or some other similar tool. Here's one place to start: https://forum.audacityteam.org/t/comparing-two-supposedly-identical-tracks/36424 https://forum.audacityteam.org/t/comparing-two-supposedly-id... https://forum.audacityteam.org/t/comparing-sound-comparing-plot-spectrum/49066/7 https://forum.audacityteam.org/t/comparing-sound-comparing-p... I like one forum user's suggestion: build an audio file where the left channel is from one recording and the right channel is from another, but in perfect time sync. For example, the left may be a recording of an Apple CarPlay rendition, while the right is a recording of an Android Auto rendition. Then it should be easy for your ears to discern the difference. The Bluetooth issue could be real. I have a Bluetooth-enabled car radio that switches between full duplex (two-way audio) and half duplex (one-way audio) mode. It sounds normal in half duplex mode, but in full duplex mode, it sounds a lot like an old telephone.