What is Metric modulation? Metric modulation is the modulation of the original metre, either upwards to a faster tempo or downwards to a slower tempo, using a subdivision of the original pulse to decide the speed of the modulation. The mechanics of the process are as follows: 1) Subdivide the original pulse into smaller or larger pulses. 2) Reorganise these pulses into regular groupings, so that the impression of a new tempo or metre is created.Book available from www.ronanguilfoyle.com