How do I connect audio inputs together?

I’m trying to make a multi-track recording from my old keyboard and I want to connect the line input to the headphone jack and simultaneously record it. Is this possible?

Yes it is possible using PulseAudio. You will need to install pavucontrol -

sudo apt -y install pavucontrol

and then follow the directions here:
(Although this example is for skype, the same basic tools for creating pulseaudio virtual devices and connecting them together apply to most any application.)

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