I use the Blue Snowball Ice usb mic. I have put mic around 6 - 12 inches from my mouth. I have used screen cast ometic Normalize and Reduce Noice functionalities of that tool. But I can hear a big echo or something like that on my audio. i.e. you need to increase the volume of the audio over 60. Can you tell me how to avoid it? I can use Audacity also.
Audio file: https://vocaroo.com/i/s1Fi2oXT8rlu