I'm glad you asked, because this will make my life easier! To make the audio even cleaner, attach earbuds to your phone as well and sing close to the microphone of those headphones. The idea is to reduce background noise as much as possible. When you sing quietly, have the headphone mic about 4 inches from your mouth. When you sing loudly, have it about 1 ft away. Also record in as quiet a space as possible! And finally, send the files to me via email rather than text. Sometimes texting compresses files, which reduces quality. If you email the files, we avoid that risk.