HvyFuel, I never thought of that, but you are right. If you talk to your plants you would give them a lot more CO2. Would only work if you had a small amount of plants. I talk to mine a lot and play music for them. Music works great, especially in the morning right before watering. I am copying the SonicBloom tech, but I play classical music for them and water them 45 minutes later. They are doing even better since I started that!