How to programmatically pass audio from audio output to audio input on android?

Question

Android

Is there an android app that can redirect audio stream from audio output to audio input? I know the iron method, but the scheme does not hurt to check and clarify. The search has not given any results.

Answer 1

The end goal is not entirely clear.
1. As far as I know, there are no analog audio inputs in gadgets;
2. Connect between ADC devices, usually equipped with drivers;
3. Pair via Bluetooth;
Everything else depends on your budget, the topic is described in detail in many audiophile forums, do not be lazy to google it.