Visitors can access the content by scanning a QR code, which redirects them to a web app that is directly accessible from their smartphones. The interface is fully responsive, adapting to nearly all screen sizes.
We developed this interface with our friends from Mosquito. The entire setup is built using SPIP, in both French and English.
One trick involved creating a video (using DaVinci Resolve) for each audio recording, displaying animated waveforms.