I get a suspicious short (100ms ?) beep sound after every phrase (stringToSay) executed with:

```
void ALTextToSpeechProxy::say(const std::string& stringToSay);

```

I get it only on my newer V6 robot, not on the old one V5. I have experienced it when running C++ compiled module, but the phenomenon may be easily observed even with the following simple .py code, executed on the robot. It's like after "hello" comes a short break and then a beep.

```
#! /usr/bin/env python

import qi
import sys

def main(session):
    tts = session.service("ALTextToSpeech")
    tts.say("hello")

session = qi.Session()    
session.connect("tcp://127.0.0.1:9559")
main(session)

```