With this service you can merge audio online
https://getvideohunter.com/
mans.io
https://mp4-to-mp3.pro
brian.girko
mans.io
http://sidex.ru/
alex.danilian
https://nirmalj000.github.io/nirmal-portfolio/
https://audio-trimmer.com
MP3 Tools
Cool Apps
https://123apps.com
