Who was the bass player on "Nothing But Heartaches" on the Supremes "At The Copa" album?

The Bass Player was literally out of sync during the entire performance throwing both the band and the group off. [[Most notably THE ENTIRE SECOND VERSE and at 1:23 when the vocals went out of sync but Diana caught up brilliantly by 1:44)

Luckily Diana was able to adjust to the erratic bass-playing and handle the performance like a pro.