If you don’t want to hardwire your soundcard’s outputs to its inputs and just record the playback like recording an external sound source, you would need a soundcard that supports internal loopback like RME interfaces for example.
If you don’t want to hardwire your soundcard’s outputs to its inputs and just record the playback like recording an external sound source, you would need a soundcard that supports internal loopback like RME interfaces for example.