## MMPM/2 Device Driver Reference

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### Audio Device Driver Exerciser (PMADDE) Tool

The Audio Device Driver Exerciser (PMADDE) is a PM-interface tool you can use to test code for low-level MMPM/2 components, such as audio device drivers or stream handlers. Using PMADDE, you can test various stages of your code at the Ring 0 level. This is useful when you want to verify that individual functions are working in your device driver without testing media control interface code (which might not be written yet). Each time you complete a function, you can test the function to see that it works, and then continue with the development of your driver.