By the time our crew, Jam-On Productions was rocking parks and block parties, it was App and Electrified Sounds that we most looked up to. Their system was dope, it thumped hard and clean! And it was said that if he didn't have enough equipment to win a battle, he would go get a 2nd van full!
He ran with the Ex Vandals out of Erasmus high... guys like Flowers Dice, Undertaker Ash, and Dino Nod
they started Electrified Sounds together.
Here's an App Super Hog from 72.