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Yes, you can use your PC as a mixer with the help of various software. There are many DAWs (Digital Audio Workstations) that can act as a mixer, some examples include Ableton Live, FL Studio, and Logic Pro X. These programs allow you to route different audio sources into your computer, mix them together, and then output the mixed audio. You may also need an audio interface to connect your devices to your PC. Always check the compatibility of the software and the audio interface with your PC.