This edition has no barcode and Mastering SID Code.
Track 1: recorded direct from cassette, 1995
Tracks 2,3,4: From the cassette "Cabezas de Cera", 1998
Tracks 5,6: From the CD "Cabezas de Cera", 2000. Recorded, mixed and mastered at Estudio EAR Audio, between 1999 and 2000.
Tracks 7, 8: From the CD "... Un Segundo", 2002. Recorded, mixed and mastered at Estudio EAR Audio, between 2001 and 2002.
Tracks 9, 10: From the first ("Metal Música") of the double CD "Metal Música", 2004. Recorded, mixed and mastered at Estudio EAR Audio, between June and July 2004.
Track 11: From the second ("Aleaciones Aleatorias") of the double CD "Metal Música", 2004. Recorded, mixed and mastered at Estudio EAR Audio, between June and July 2004.
Track 12: Recorded live at the Sala Ollin Yoliztli, June 9th, 2005.
Track 13: Recorded, mixed and mastered at Estudio EAR Audio, September 16th, 2005.