Consider that God created the waves that comprise our universe. God transcends His creation but can and does interact within it. To be sure God may have the means to commune with Man apart from all that is known about information transmission, but there is reason to accept the likelihood that He also uses the wave forms He created. Also, consider that the Holy Spirit indwells repentant mankind. As our own minds have the capacity to generate wave forms that pass through our neural networks, so also does the Mind of God via His indwelling Holy Spirit.