We checked the Moto X Pro Android 5.0.2 ROM, Motorola disabled the call recording feature by a "impossible to bypass the limit" way. As a result all recorders in the market can only record your voice, the caller's voice can't be recorded.
So you must root your phone, then Boldbeast Recorder can fix the problem.
After root the phone please use these settings to record calls:
- Record Mode: 1, 5 or 7
- Tune Audio Route: Group3
- Change Audio Controls: Yes
- Change Audio Driver: No
- Start Input Stream: Yes
Now your Moto X Pro records calls clearly and loudly in two directions.