Boyd Tinsley Band and Jimmie's Chicken Shack discography help needed

A user submitted some minimal discography information for Monk Siddiq and mentioned in their note that:

Brian Wagoner was the bass player in the Boyd Tinsley Band and sang on "Slow Change" by Jimmie's Chicken Shack.

Unfortunately, they didn't provide an email address so I couldn't follow up to ask for more information. Here's what I need from anyone that can provide it:

1. Is Brian Wagoner on any recordings released by the Boyd Tinsley Band? Did the Boyd Tinsley Band release anything?
2. Who else is on "Slow Change" by Jimmie's Chicken Shack? And is Brian Wagoner on the version on the Slow Change EP or is it some other version we're talking about?