Since you’re not on a supported Android version for LANnouncer (5.0+) and you’re already using Tasker, you could use Tasker with SharpTools as an announcer. Subscribe to whatever attribute you want to use as a trigger in SharpTools by long pressing on the device. Then in Tasker, create a new profile with Event → Plugins → SharpTools → Thing State. Then in the action, you can speak a command with Alert → Say.
There are also options for:
Alert → Beep(tones)Media → Music Play(mp3/wma)Media → Play Ringtone