Meanwhile, complexity increases given the addition of 27 instruments, and one gets the impression of following a multi-layered piece; the traditional instruments, in their relationship with electronic sounds, have several functions:
a) Underlining and timbral expansion of electronic sounds, as in the case of the 10.4'' piccolo tam
b) Completion of phrases
c) Relative autonomy of the instruments in moments when the functions separate; see when the tape stabilizes on a static band and the traditional instruments continue to interact with each other through single strokes, chords, or phrases (see 3' 9.1'')
D) Mixed situations, see the concomitance of a and c)
Etc
Even if at a perceptual level it is certainly something else, no sounds are removed or added compared to the tape-only version (which can be in quadraphonic, stereo, or mono). This means that for S., the presence or absence of instruments does not necessitate any modification of the formal functions of the tape. They can be obscured, confused, downplayed, or highlighted through fusion or contrast via the intervention of the instruments, but they constitute a texture without which the piece would make no sense.