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It is used to remap the output of the numerical algorithms to a more useful midi note ranges.
For example if an algorithm outputs number between [0-1] setting a-linmap with parameter [0 1 1 127 x], where x is the current algorithm output number (between 0-1) the map enlarges this value between 1 and 127. The fifth value, x, "bangs out" the result. Hope that it makes sense.
Yes."PS: Reset, INIT, step - are Signal modules, right?"
You're right, what is written in the pdf is probably not very clear in terms of final usage. Note that there is a certain freedom for the usage of the chaotic objects: for example they can be used as LFO, volume envelopes, pitch mapping. Attached is a very basic example, a non-repeating sequence based on Henon algorith. Unzip it, put the .xml in the preset directory of Architect, attach a VST to the architect midi output and start the transport, the music should flow..more indices how to connect fragments to final midi output.
Alberto