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My Father is deaf and uses a hearing loop around his neck to pick up audio. However, this needs a large, bulky box to amplify the sound.

He bought a 3.5mm jack to Headphone + Microphone splitter (link is as an example, not as an advert) which works with the iPhone; we tested by recording then playing an audio file.

However, we need an app that will play audio in over the speakers / headphones out - in real time, a little like this in Windows.

We found a few apps, but they all seem to record and then play it back. Is there one that will do this?

We would like a free app (of course) but will happily pay a little if we know it will work. This is an iPhone 4 which is fully updated.

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