Access VIRUS|POWERCORE User's Reference Manual
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VIRUS POWERCORE MANUAL 29GETTING STARTEDAmplifierOnce the signal has been suitably filtered, it then passes tothe amplifier to be shaped by the amp envelope. The waythat the volume of a sound changes over time is crucial toour perception of it, and so just like the filter, this is a veryimportant stage of any synth sound. Believe it or not, oncertain old electronic organs, the only difference between the piano and trombone presetswas the shape of their amp envelopes!! (Bear in mind of course that it took a certain degree ofimagination to hear either as a piano or a trombone!)A typical 4-stage amplitude envelope forces the sound to follow a specific volume curvethrough the following stages - Attack, Decay, Sustain, and Release, with Attack determiningthe time it takes for the note to reach full volume once a key is pressed, Decay determiningthe rate at which it falls to the level at which the note will Sustain, and Release being the timeit takes the sound to decay to silence once the key is released. The Virus PowerCore actuallycontains a 5-stage envelope, due to the addition of a Sustain Time parameter. This is used tocreate an additional crescendo (volume swell) or decrescendo once the note has reached thesustain level.Note that the filter section also has a dedicated envelope for dynamically controlling the cut-off in a similar fashion.EffectsOnce the sound has been successfully mangled by the filters and amplifier, it then gets sentto the Effects section. Here you can choose to colour the sound with several different (simul-taneous) effect types, including Analog Boost, Distortion, Chorus, Phaser, and Delay/Reverb.Modulation MatrixLast, but by no means last as it happens, is the mod matrix. This is a very powerful tool thatyou can use to dynamically control several parameters at once via a number of different con-trol sources. The available control sources include LFO's, (see below) envelopes, MIDI notevelocity , modwheel and pitch bend as well as several others.indigo powercore manual.book Page 29 Thursday, April 22, 2004 12:23 PM |
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