Audio cutter/editor extension?

[Django_s_Android_App (Django)]

This may help you:

[FREE]WaveAudioTools extension v3

This extensions let you mix or combine 2 wave audiofiles in different ways: Now you can create karaoke-like-apps, mix tracks together or combine them, create long wavefiles from short loops (e.g. drumtracks) as a backline. ** min API21 required ** Updated added “Trim” method to let you cut a wavefile **Important:**The files must be of same format, 16Bit/44100/stereo or 16Bit/44100/mono wave format. You will notice a slight "click or “swoop” at the seams of the combined files. Maybe one day…

And this link is always a good choice when you are looking for available extensions :

App Inventor Extensions | Pura Vida Apps