What is best record mode? I use a plantronics blue tooth. Under mode 1 there is just a buzz on playback
Galaxy S5 has many variants, some of them records calls well, some of them have been disabled the call recording feature by Samsung. If the call recording feature of your phone is disabled, Boldbeast Recorder can fix it (some phones need root).
Please test these settings for Galaxy S5 (and any other Galaxy phones): http://www.boldbeast.com/forum/topic890 … hones.html