length in 4/4 bars, 2 to 64
names the scene; it is mixed into the seed so two scenes with one seed still differ
tonic as a pitch class, 0 (C) to 11 (B)
Optionaltempobeats per minute; derived from mood and tension when omitted
0 (relaxed) to 1 (urgent): faster, denser, more repeated low notes
most notes sounding at once, 1 to 8: 3 writes for a 3-voice SID or YM chip
everything the composer needs, as plain data a save or a share link can hold