Droidplanner works but I am not getting any voice notifications. The Pico voice engine works though, tested it in other apps and the system settings. It is enabled in the Droidplanner settings though.
Im running it on a Galaxy Note 2 with Android 4.3.1
Do you have more than one version of DP on your Tablet? I had a similar issue. I’m not %100 sure but I think because I had two versions on the tablet and accidentally launched both it somehow wigged out and it took me awhile to get it working. You might want to just uninstall DP, reboot your tablet, reinstall DP.