How do I use Sound Siphon with macOS' built-in transcription?

1. Go to System Preferences -> Keyboard -> Dictation

2. Select a Sound Siphon input device as the microphone.

3. Go to System Preferences -> Accessibility -> Dictation

4. Disable "Mute audio output while dictating".

5. Now go to a text editor and start dictation with your dictation shortcut. Audio from Sound Siphon will be used for dication.