In theory I think @Steve_Lambert is right but PiMuiscbox keeps the file at /etc/wpa.conf and it also rewrites the file on every boot so you’ll lose your changes. The easiest thing would be to put the suggested contents in /etc/wpa.conf but then edit /opt/musicbox/startup.sh and comment/delete the section that rewrites the file. You would want to keep the part that brings the interface up though.
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