MME a very old microsoft driver - safe and reliable for playback but lots of lag when you record - almost impossible to sync recordings with BIAB generated tracks. WAS - a newer microsoft driver that virtually eliminates lag and is fine for recording. ASIO is usually specific drivers that came with your audio interface so should give optimum results. but note ASIO4ALL is not a specific driver for any particular interface and some on the forum have found it not 100% reliable.