Yes! Starting with Sound Siphon 2.0.2 a public API is available for developers to include the ability to control Sound Siphon from their application.
Download Sound Siphon Public API
A small sample application demonstrating the user of Sound Siphon Public API is included as well.
Free
- Capture All Audio with the “Sound Siphon In” device
- Capture audio from specific apps if user owns Sound Siphon