 In the former case the tempo will change as the number of micro-pulses (which maintain their rate) within the beat change; in the latter (signaled in the score with doubled bar lines) the subdivision will change while the macro-pulse stays the same.Within the progression of modulations different voices behave as though they are in different meters as different voices either prepare, result from, or resist meter changes, not in congruence with each other.This allows Carter to move smoothly between asynchronicity and synchronicity of voices.