Sorry, but this app is rubbish. It does record, but completely ignores settings to record as mp3, and instead records and saves as wav format. Also, even the wav file audio is at a tiny fraction of the volume of the original sound. Tried on both video and youtube, with same result.
Clicking on the little ‘Edit’ icon does …. absolutely nothing.
So glad SoS had this as a free offer, as I’m so glad I didn’t pay for it :(