How to stream phone's internal audio to the recording of an app? - General Questions and Answers

How could I stream sound (from an app) to act as if it's the recorded sound (on another app on the same phone)? I'm looking for switching the stream of the microphone from the actual hardware microphone to the internal sound of the phone.
Purpose:
I listen to podcasts (I use Pocket Casts). Sometimes there are spoken words I can't recognise. I need to have a voice recognition app (I use SpeechNotes) listen to the sound played from Pocket Casts so that I can know what were the words I missed.
More Info:
Android version: 6.0.1 (rooted with xposed installed).
Device: Samsung Galaxy Note 4 Exynox (N910c)

If it is impossible to stream audio of podcasts app to the voice recognition app directly, perhaps you may stream it to an audio file, and then manage to feed the voice recognition app with that audio file. Good luck to you.

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i know TuneIn Radio can record.
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