![]() ![]() Distortion and high synth notes are among the most common sources of audible aliasing.Ī typical technique for reducing aliasing is oversampling, and some software lets you set the amount of this higher values mean a greater CPU hit but less aliasing. AliasingĪ type of digital audio artefact, often manifested as high-frequency unmusical 'hashing', or tones that seem to move down in pitch as the musical note moves up, and vice versa. The algorithms that the programmer invents and employs are directly responsible for the resulting sonic quality of their plugins. The underlying method(s) that software uses to process audio, as designed by the programmer/developer. Alternative envelopes exist too - some have a Hold stage, or a Delay stage before the Attack. We've been talking about the amplitude envelope here, but ADSR envelopes can be applied to other parameters, such as filter cutoff, for example. Note that in this context, Sustain is usually a fixed, continuous level (unlike our guitar example above.) ![]() ![]() So, if you want a fast, snappy attack to your sound, turn down the Attack knob/slider to make it faster turn it up for a gradual fade in. The ADSR system is often used in software instruments to allow the user to specify volume shaping to be applied to the sound over time, such as in a synthesiser. In some instruments, the sustain level is not constant, such as the guitar, where it fades slowly. Sustain is the level at which a sound remains until the player ends the note Release tells us how fast it fades away once the player releases the note. ![]() Next comes Decay, which controls how quickly the sound level falls to a stable state. The first phase of a note's sound is the Attack, be it the quick pluck of a virtual guitar string (pictured right) or the gradual fade in of orchestral strings (left). This can be quite a complex curve (aka envelope,) but for many sounds, it can be simplified to the parameters Attack, Decay, Sustain and Release: ADSR. The volume (amplitude) of a real instrument changes over time. ![]()
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