My immediate thought was Vigilante 8, too, but I also didn't remember an announcer in that...Bandyman said:It sound like Vigilante 8 [http://www.mobygames.com/game/n64/vigilante-8] but i'm not 100%?, I don't recall a lady announcer.Blinders said:Hello Everybody! I've been trying to put back my old N64 game collection I had as a kid (my house was robbed around age 8 or so and I lost all nintendo 64 games). The game I cannot remember is a vehicle/battle game I used to play with my siblings. You could pick up different weapons and there was an announcer lady that would announce things during the match. One of the things I remember most about it was a power-up/weapon called "Railgun" it was basically an auto turret for your vehicle, and the announcer lady would announce it when you picked it up. I know this is a long shot, but I am out of ideas. Thank you in advance for any help!
https://www.youtube.com/watch?v=fhaJiA4XkaE&t=90s&ab_channel=Kinaibhlan
My other suggestion is Carmageddon 2 [http://www.mobygames.com/game/n64/carmageddon-2-carpocalypse-now] but that feels wrong, but its here in case it is :S
https://www.youtube.com/watch?v=UJg7QCZ-UGI&ab_channel=QQHHGaming
The big question here: was the game just fighting in an open arena like Twisted Metal and Vigilante 8, or was it a racing game with weapons like Mario Kart and Wipeout? If it involved racing, I'd suggest Extreme G 2 [https://www.youtube.com/watch?v=VDCufpfwblc] (skip to 36:20 in the video to hear her say "railgun"). =)