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Chapter 7: USING SAMPLES > 7.7 MIDI performance control - Pg. 182

Audio Sampling the voice is usually characterized by a smooth tremolo, sinu- soidal in wave shape. The use of LFOs in signal processing offers the opportunity to select any available wave shape for tremolo. 7.6.3 Articulation Articulation describes the amplitude profile, or envelope-- that is, the changes in the amplitude and harmonic content of a sound as the performer exercises deliberate performance techniques such as bowing (stringed instrument), tonguing (a wind or brass instrument), striking (a percussion instru- ment), or plucking (a string instrument). The simplest ampli- tude history of a performed sound can be defined by the nature of the attack, decay, sustain, and release components of the envelope. 7.6.4 Dynamics Dynamics denotes the amplitude profile of a phrase or passage. Fixed dynamic levels establish the balance or mix of the ensemble to ensure that the melodic and supportive elements are in the correct relationship. Gradual changes in amplitude (crescendo or decrescendo) add performance nuance and tension/relaxation to the expression of a line. 7.7 MIDI performance control The digital control of musical instruments provides great flexibility, accuracy, and variety to the performance of sound samples. When performance control is via MIDI, the samples can be stored in either analog devices or digital devices. As MIDI is a system for recording, storing, editing, and recall- ing performance attributes, it must be considered separately from the sound sources. Its control features apply to sound sources of analog or digital synthesis, and to sound effects as well as musical sound samples. The source of sound is not the domain of MIDI control; it is the execution and modula- tion of those sounds. 182