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From: Bernard B. <ber...@gm...> - 2020-07-09 13:33:01
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I recorded 2 videos of the old BP2 for users who can't run it under recent MacOS. These can be downloaded (for one week) from WeTransfer.com: MOZART = https://tinyurl.com/yd4zn6am KOTO = https://we.tl/t-yN9HCbWfy5 MOZART VIDEO The Mozart demo shows how to "run" a grammar with a setup allowing continuous production, which means that new items are produced and played forever. To avoid a saturation of the MIDI buffer, BP2 measures the time T taken for producing an item and starts producing the next one only once playing the current one is about T before its end. In the second part, I selected well-formed polymetric expressions and called "play selection" which use them as start strings and play their final derivations under current settings. The Mozart score is piano-roll, by default when the "terminal vocabulary" is made of "simple notes" rather than complex sound-objects. I have chosen this first example because its rendering on PianoTeq sounds nicely and it is a true instance of Mozart's musical dice game using the probabilities of numbers 2 to 12… KOTO VIDEO This one uses a "koto" sound produced by General MIDI Player, unfortunately quite bad compared with my old Roland D50 synth. The process is the same: continuous production and sound output. However, items differ because they are produced by substitutions performed "in parallel" on an initial string. This is a simple unidimensional cellular automaton. The output is "sound objects": a, b, c etc. with topological properties, e.g. forced continuity between certain objects that produces a natural flow instead of a strict metronom timing. Some objects such as <<f>> and <<chick> are "out-time", i.e. with null durations. Bernard Bel |
