I recommend this great recorder app for all.
It is hidden/stealthy, and you can use it to schedule all future recordings. Just Perfect!!!
I'd been using it for months, and it was working fine. Then, Google Play automatically updated the app on May 4, and that update broke the app. The app has continued to record phone calls, but I did not realize the update was broken until I played back the recordings earlier today.
I downloaded and installed https://play.google.com/store/apps/details?id=com.spectrl.rec the problem is, it's saying (Could not gain root access. app requires superuser permissions to run), I downloaded and installed https://play.google.com/store/apps/details?id=com.noshufou.android.su but it tells me that it failed, does anybody know this? or find another one without root permission?