Dal segno is an Italian term. Whether pronounced in Italian or English, the G is not pronounced that way. In IPA, please note: /ˈseɲ.ɲo/ not /ˈseg.no/. Think more Spanish señor. Example: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xhidIQkVaZI.html