I have a massive background in sound processing and I'm familiar with WAV file format, so this task looks simple for me. Could start today, and it won't take much time.
Once the task is completed, I'll deliver you the source code, so we could work out any of your objections and proposals together.
I have no track of jobs here on Freelancer, but will be proud to complete your task and to make sure you're 100% satisfied with the solution.
Thank you in advance!
Regards,
Alex