Hendrix , Chas Chandler and an engineer called Eddie Kramer had to re-mix the songs in one night . They could not get the song `` If 6 was 9 '' right , but Hendrix 's bassist Noel Redding had a copy of it on tape . With the release deadline looming , Hendrix , Chas Chandler and engineer Eddie Kramer had to remix most of side one in an overnight session , but they could not match the lost mix of `` If 6 was 9 '' .