Check out "Call Recorder | Boldbeast"
https://play.google.com/store/apps/details?id=com.boldbeast.recorder
I use that one.
It doesn't list the OnePlus One - but it's highly configurable and the Play Store description links to the XDA thread for support.
It's not as slick as the smsrobot CallX, nor as mature.
I got turned on to it courtesy of one of our own app announcements threads.
It does offer a lot of voice recorder methods - 11 for non-rooters, 7 for root - you try them until you find the best one. That's why I like it - previously my HTCs, rooted or not, were more difficult than the unrooted Nexus.
Not as slick includes meaning no automatic email or cloud autosync - but I have Autosync for Google Drive that handles everything so I don't much care.
@funkylogik see if it will work for you.
@rabers couldn't hurt to try and / or visit the XDA site, I'd hate if I'm handing out old information on the Nexus. Last I checked it required root.
https://play.google.com/store/apps/details?id=com.boldbeast.recorder
I use that one.
It doesn't list the OnePlus One - but it's highly configurable and the Play Store description links to the XDA thread for support.
It's not as slick as the smsrobot CallX, nor as mature.
I got turned on to it courtesy of one of our own app announcements threads.

It does offer a lot of voice recorder methods - 11 for non-rooters, 7 for root - you try them until you find the best one. That's why I like it - previously my HTCs, rooted or not, were more difficult than the unrooted Nexus.
Not as slick includes meaning no automatic email or cloud autosync - but I have Autosync for Google Drive that handles everything so I don't much care.
@funkylogik see if it will work for you.
@rabers couldn't hurt to try and / or visit the XDA site, I'd hate if I'm handing out old information on the Nexus. Last I checked it required root.