When Talkler is ready to listen for a voice command, you'll see the Listening Mic onscreen, and hear a "bloop" sound. If you speak too quickly, or if your spoken voice command overlaps with the "bloop," then Talkler might not understand what you said. The solution is easy:
Pause for a fraction of a second after the "bloop" and before speaking your voice command. Talkler actually starts listening for your voice a fraction of a second after the "bloop." (Helps to distinguish between your voice and the echo from the "bloop" in certain acoustic settings.)
So if you're having trouble being understood, try pausing for a fraction of a second after the "bloop"!