Assume you have a call. I would like to play a piece of one song to the caller at one point of discussion, while keeping your voice too in the discussion. I am using Android 6.0 CyanogenMod with Samsung Galaxy S4.
Edited: According to Media Playback's docs, the standard Android system does not allow the feature. However, I am interested in how this restriction works. If the feature works in non-rooted CyanogenMod, then it is not a restriction. Also, I am not sure if Media Playback's manual applies to the whole system.
How can you direct Music Player's output into the ongoing discussion?