Is there a way to control SoundSwitch from the command line?

Yes — SoundSwitch ships with an official CLI (SoundSwitch.CLI). It is bundled with the installer and added to your PATH so you can call it from any terminal:

SoundSwitch.CLI playback next
SoundSwitch.CLI recording next
SoundSwitch.CLI mute toggle

See the CLI usage page for the full command reference.

Third-party tools

Historically, before SoundSwitch shipped with its own CLI, the recommended workaround was NirCMD, which can change the default playback device from a script. It is still useful for very advanced scenarios that the SoundSwitch CLI doesn't cover.

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Source: #1081