So, to be able to record the system sound your sound card needs to actually do 2 actions: transform it to an analogue signal and then record that signal. If you hit "record" in audacity it will try to record the analogue source, but there is no analogue source, hence your audio wave will be flat (i.e. When a system sound is a triggered it is sent as a digital signal to your soundcard, which will turn it into an analogue one before output. it takes an analogue signal and will transform it to a digital one (or vice versa). You need to make sure that your sound card is treated as a loopback device.Ī soundcard takes an input signal, transforms it and outputs it as a different signal. (disclaimer: I'm sacrificing correctness for understandability here)
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