Simultaneous System & Mic Audio Recorder

I'm in need of a simple desktop application program that can record both system audio and microphone input concurrently. The program should function seamlessly whether the system is on speaker mode or headphones are plugged in.

Key Features:
- If a song is playing on the system and the user is singing into the microphone, the program needs to record both at the same time.
- The audio should be saved in WAV format.
- The program should provide both options for output: a single merged file and two separate files.
- High quality audio settings are needed for the recording.

Ideal Skills:
- Proficient in Python programming.
- Experience with audio processing libraries in Python.
- Understanding of audio quality parameters.

Please ensure that the final product meets these requirements.