thx janui
no problem, it was only the 1st scan (same on PC+Winamp; full scan also takes about 20 min)
unfortunately I couldn´t get the wifi to work.
In the beginning, my network appears in the list, but didn´t connect.
(neither with password, nore with security disabled in router)
A few restarts later, my network was vanished from the list, but the surrounding wifis were still displayed (my other wifi-devices work fine).... very strange
btw I´m on "rAudio-RPi2-20240108"