Welcome to TonUINO project and community.
Obviously your TonUINO is working perfectly but there seems to be a little lack in understanding the play modes:
Find german descriptions in „Eine Karte neu konfigurieren“ You may use deepl.com for translating which returns reasonable results.
The SW is not prepared to turn off the detection beep only but if you are happy with turning off hte beep in general simply delete file 262.mp3 from folder mp3.
now some play modes in brief:
- Audio book (Hörbuch) - plays all files of a folder in sequence (to the end or until you stop manually) and saves the last track completed persistent to EEPROM as prograss counter.
Next time you start with that card the TonUINO will continue with next track after prograss counter - Audio book (single file) (Hörbuch einzel - almost same as Audio book but this mode offers to limit the number of tracks beeing played. Playing will stop automatically after given number of tracks has been played. Number of last track completed will be saved as progress counter.
Next time you start with that card the TonUINO continues with next track after progress counter but will stop automatically after given nuber of tracks. - Radio play / Episode (Hörspiel) - plays ONE random file from folder
Keep in mind the progress counter will increment only after a track has completely finished
To achieve this I would recommend using „Radio play“ mode.
Hope my english is clear enough to help.