Named an Indiana All-Star in 1968, following a stellar career at Holland High School, which consolidated with Huntingburg High School to become Southridge High School. He started from 1964–1968, and led the Dutchmen to Sectional Championships in 1967 and 1968. They finished the 1968 season undefeated but lost the Regional Championship game to perennial power Jeffersonville High School. Buse was selected to the Indiana All-Star Team in 1968.
Buse was known for his dependable ball-handling, tight defense, and clutch-shooting, and he appeared in two All-Star games (one in the ABA in 1976; one in the NBA in 1977) during the course of his career. His best season occurred in 1975–76, when he led the ABA in both steals per game (4.12) and assists per game (8.2) while also contributing a career high 12.5 points per game. In the next season, his first in the NBA, Buse again led all players in steals per game (3.47) and assists per game (8.5).