Finally! Loopaza Mega Store has posted a video to their Facebook page showing off the sound chip in LG31 Fortress Maximus' head, Cerebros/Fortress!. As hoped and rumored, it does in fact have a short version of the Headmasters theme! The rest of the voices are Japanese dialogue (of course), with lines such as "Transform!", "I am Fortress," and of course "Head On!" Keep reading to see the video!
Legends Fort Max is of course TakaraTomy's release of Titans Return Titan Class Fortress Maximus, which includes the previously SDCC-exclusive Master Sword and alternate Titan Master/Headmaster for Cerebros/Fortress.
