bitKlavier 对比 JAX Unisonic (Audio Unit) 的使用情况和统计数据
“The études, some fast and virtuosic, others spare and introspective, unfolded to beautiful and haunting effect in a haze of pitch-bending, echoes, distorted rhythms and eerie timbres.”
—The New York Times, about the Nostalgic Synchronic Etudes, made with bitKlavier
bitKlavier is the software that drives the "prepared digital piano;" it has been used by a number of composers for creating new music, and has been featured in performances around the world.
Like the prepared piano, the "prepared digital piano" feels just like a piano under the hands and often sounds like one, but it is full of surprises; instead of bolts and screws stuck between the piano strings, virtual machines of various sorts adorn the virtual strings of the digital piano, transforming it into an instrument that pushes back, sometimes like a metronome, other times like a recording played backwards. The virtual strings also tighten and loosen on the fly, dynamically tuning in response to what is played.
To begin, experiment with the included galleries, many of which are from existing pieces (the Nostalgic Synchronic Etudes by Dan Trueman, and the Mikroetudes, a collection of small pieces by various composers), others are examples for exploring the various types of digital preparations. Work with the on-screen keyboards, or hook up a USB-MIDI keyboard using a Lighting-USB adaptor and play with a full-sized keyboard.
There are a range of "preparations," including:
1. Synchronic: "metronomes" of various sorts that respond to your playing.
2. Nostalgic: reverse piano, synced to the synchronic preparations or driven by the length of the notes that you play.
3. Tuning: various tuning systems, including some that change under your hands as you play.
4. Direct: modify the direct sound of the piano itself in various ways.
5. Blendrónic: beat programmed delays that process other preparations.
These preparations can change under your hands in various ways, using Modifications attached to Preparations and triggered by Keymaps, or by using Pianos, which change the entire instrument instantaneously.
Created by Dan Trueman and Mike Mulshine at Princeton University, with support from Princeton's Music Department, Center for the Digital Humanities and Council on Science and Technology, as well as the American Council of Learned Societies.
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JAX Unisonic is a special Audio Unit, able to produce up to 8 additional voices from any audio input (also polyphonic audio) by multiplying and shifting it in pitch and other parameters. Audio Units require a host application for operation.
The concept of JAX Unisonic is loosely derived from ‘Unison’ which was adopted from the ancient analog synthesizer world, where manufacturers and sound designers intended to fatten the sound by multiplying and stacking available voices together. Also digital synthesizers did adopt this technique to fatten sound sources.
Due to the instability of analog oscillators and components and some wilful detuning, an interesting sonic effect is achieved, giving the produced tones significantly more presence and life. Unison voices are still excessively used in modern music styles today. (In classical music compositions ‘unisono’ basically means a performance, where multiple instruments or voices play the same parts in an ensemble fashion.)
Technical
Now JAX Unisonic can simulate this sonic effect with any audio source by incorporating a bank of independent time domain pitch shifters, that are optimized to detune and spread artificially multiplied voices in panorama. It can be understood as a kind of super chorus generator or an ensemble like effect with variable, realtime controlled intensity and pitch relation. But it is clearly something more.
With JAX Unisonic you can create up to 8 additional voices, that will be passed thru a chain of pitching and positioning, creating massively fattened sounds with any kind of voice input. Additionally you may transpose each voice individually per semitone to max. +/- 1 octave, something that cannot be achieved with usual choruses, unison or ensemble effects and moves the results slightly in the direction of the category “harmonizer” effects. Although the harmonic results can be programmed (automated) freely and are not auto generated in any way, as on some available other harmonizers.
The used pitch shifters in our JAX Unisonic are NOT based on the phase vocoder paradigm (FFT) and do not introduce the static latencies, which are unavoidable by the latter. A time domain pitch shifter in contradiction, uses very small delay buffers, where the latency is dynamically adjusted (dependent on the used pitch shifting amount) and much smaller and nearly latency-free. Such pitch shifters are better situated for live usage therefore. Although, such pitch shifters sound slightly more raw and tend to produce disharmonic overtones with more extreme values.
Usage
JAX Unisonic may be used as a massive unison effect generator or more decently for creating various, more subtile effects for improving sonic qualities of parts in a composition. For instance controlled voice detuning, manual pitch correction, doubling of vocals or solo instruments or just to give some boring voices more interest and static sound some special movement. It is even usable with drums, adding subtile or even massive new frequency components.
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bitKlavier VS. 
JAX Unisonic (Audio Unit)十二月 18, 2024