audacity
[youtube https://www.youtube.com/watch?v=DJhIlsLH32I&w=560&h=315] [youtube https://www.youtube.com/watch?v=8ClwSNm362E&w=560&h=315] Bouncing audio with Audacity: [youtube https://www.youtube.com/watch?v=HQ2GoReFgV0&w=560&h=315]
[youtube https://www.youtube.com/watch?v=DJhIlsLH32I&w=560&h=315] [youtube https://www.youtube.com/watch?v=8ClwSNm362E&w=560&h=315] Bouncing audio with Audacity: [youtube https://www.youtube.com/watch?v=HQ2GoReFgV0&w=560&h=315]