One Fine Morning & Take it Slow by Lighthouse appear on one or more samplers, but were never part of an LP release in quad. There is a latter day version in 5.1 of One Fine Morning.
https://www.quadraphonicquad.com/fo...pilation-track-listings-here.8470/post-455492
https://www.quadraphonicquad.com/fo...pilation-track-listings-here.8470/post-383380
https://www.quadraphonicquad.com/fo...f-sunny-days-cd-dvd-5-1-mix.14033/post-122269
Also Lighthouse had "Hats Off To The Stranger" on this EV-4 album from Evolution.
Also a bevy of other artists tunes on that label.