in app i see so many settings options, how can i download a guide/help to explain what these settings mean so that i could make a better judgement and better choice to configure my Boldbeast options for recording.
for e.g. these are just some of them

settings > call settings > record mode
settings > call settings > fix recording issues > tune audio route



Sorry, at this moment there is no user manual.
Usually, just tap "Set Default Settings" in Boldbeast Recorder, the app will set settings suitable to your phone.
And here are commonly asked questions: http://www.boldbeast.com/android/call_r … oting.html to know the reason.