Every peice in a unit-band-quartet-five peice ensamble, wants it's own time and space. Every part is supposed to be on beat, but, the different parts are going to start and fade at different times in terms of milliseconds to occupy their own space and time and still work together. If they aren't working together, then the players aren't working together. This is true of a group effort, <--several musicans playing together, or adding parts one at a time. Frequency will be space needed, and time will be the very infinitesable time between start of a note, end of a note, on each part. If all parts are tune, the harmonic freqs will combine when timed properly to create a five part, four part, three part voice. Intensity, volume, gain, are obvious adjustments, tonal frequency allignment in fine increments---EQ--- is a bit more complicated in terms of emanation and decay at the same rate within a peice.