Meditation is intention focused.

So you need to set the intention prior to moving into the meditative state.

If your intention is for audio clairvoyance then ypu could achieve this with practice.

The "gateway" or Monroe Institute is focused around Bob Monroes work on audio / frequcies aiding achieving meditative states.

Its just a tool to get there, like everything there are many other tools you can use and you need to find the tools that work best for you.

Based on the CIA use of this technique id be cautious of who you chose to implement it.

Like all tools they can be wielded for good or bad intent.

I perfer soverign techniques that require no other external input i cannot control, The guidiance of a master/mentor post meditation helps hone the practice and experience over time.