You can set your desired microphone in the Talkatoo Settings
If your computer has a built in or other microphone attached to it, you may run into an issue where Talkatoo defaults to using the wrong one, resulting in poor dictation results.
To ensure Talkatoo is using the correct microphone, you can navigate to the Settings menu (click the 3 vertical dots on the Talkatoo toolbar).
You will see something like this:
There is a setting in Windows that lets you set a Default Communications Device which is why you see the same microphone twice, one with Communications - in front of it. This can change depending on what has been set before, so if you frequently add and remove microphones to your computer, you should choose the entry without Communications - in front of it to ensure it's always set to the desired mic.