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Valhalla Delay is a plugin which simulates the sounds of a number of vintage delays, including tape based delays (such as the sound of Roland Space Echo, Maestro Echoplex, or reel to reel based tape delay units), "bucket brigade" delays, 1980s digital delays, and delays with pitch shifting. [31]
CLever Audio Plug-in or CLAP is an open source software architecture, application programming interface and reference implementation suite for audio effect plugins as used in multimedia software such as digital audio workstations, audio editing software, and video editing software with integrated audio workflows.
Formant frequencies, in their acoustic definition, can be estimated from the frequency spectrum of the sound, using a spectrogram (in the figure) or a spectrum analyzer. However, to estimate the acoustic resonances of the vocal tract (i.e. the speech definition of formants) from a speech recording, one can use linear predictive coding .
LV2 (LADSPA Version 2) is a set of royalty-free open standards [2] for music production plug-ins and matching host applications. It includes support for the synthesis and processing of digital audio and CV, [3] events such as MIDI and OSC, and provides a free alternative to audio plug-in standards such as Virtual Studio Technology (VST) and Audio Units (AU).
Pitch correction is a form of pitch shifting and is found in software such as Auto-Tune and Melodyne to correct intonation inaccuracies in a recording or performance. Pitch shifting may raise or lower all sounds in a recording by the same amount, whereas in practice, pitch correction may make different changes from note to note. [5]
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For example, one could move the pitch of every note up by a perfect fifth, keeping the tempo the same. One can view this transposition as "pitch shifting", "shifting" each note up 7 keys on a piano keyboard, or adding a fixed amount on the Mel scale, or adding a fixed amount in linear pitch space. One can view the same transposition as ...
EasyEffects (formerly known as PulseEffects) is a free and open-source GTK application for Unix-like systems which provides a large array of audio effects and filters to apply to input and output audio streams.