The recorded version of Amanece (here linked to the original preview video clip) sung by Jaime Morey is not that special either, but I cannot say no to a good quality stereo recording of a song with powerful orchestral arrangement and the adequate performance of Jaime Morey with just enough pomp and circumstance. An ok song and an ok recording among many great entries by Spain.
I of course didn't have the opportunity to see and hear the song in person in Edinburgh 1972, so I cannot say what the song really looked and sounded like, but the video recording of the song is a real let down. Jaime Morey is slightly too earnest and tries too much to impress the audience, but the song is not enough for the audience to be impressed about.
Decades before the HD, digital surround sound and home theaters the average sound quality of a television broadcast was not suitable for big musical experiences and the elaborate arrangement by the composer Augusto Algueró is lost on its way from the Usher hall stage to the home of a television viewer.
The result is rather forgettable and bland Eurovision entry and not one of the better Spanish entries of the 1970's. Between the two runner-ups (En un mundo nuevo from 1971 and Eres tú from 1973) this song is mostly forgotten.
My points 2/5.