It is a very good idea -in my opinion-, I do this all the time! Usually I use an earphone that played Shannon's subliminal and listening to audio book from speaker while consciously hearing both sound and while playing games with eating snacks. Too much multitasking, LOL 
Bottom line, it works. Just remember that you still can consciously heard the subliminal

Bottom line, it works. Just remember that you still can consciously heard the subliminal
