anityaḥ śabdo bhavati kṛtakatvāt, tatpunaḥ kṛtakatvaṃ kiṃ śabde 'sti nāstīti ceti, tasyāstitvamupanayat pratīyate
"Sound is non-eternal because it is produced" - but whether this being-produced exists in sound or not, its existence is understood through the application.