Conversation so far:
when was the return to the quartet?
In April 1997, the Flecktones became a quartet again, as they added saxophone player Jeff Coffin to the mix.
did they record an album?
In June 1998, the Flecktones released their sixth album, and fifth studio album, Left of Cool.
how did the record do?
CANNOTANSWER.

Question: did they produce any other records?
Self-contained rewrite: Besides Left of Cool did the Flecktones produce any other records?