![]() As noted by Izhaki (2008) despite the fact that light is used, Opto compressors are slow to respond to rapidly changing musical dynamics making them a poor choice if quick clamping on transients is required. A bulb, illuminated by the level detection circuit, shines on a photo-resistant material to control the amount of gain change. Optical compressors (more commonly known as Opto) use a light and a light sensitive resistor to alter gain (Case 2007). The classic Fairchild 660/670, Altec 436 and modern Manley Variable Mu are all examples of compressors that use valves for gain reduction. This can make them a suitable choice for drum busses and full mixes when preservation of transients is desirable. Due to the use of a valve for gain reduction, Vari-Mu compressors are not as fast as the transistor-based units. Vari-Mu compressors do not have a ratio control and increasing amounts of gain reduction are achieved with louder levels (Izhaki 2008). As pointed out by Case (2007) a circuit is sent to a valve by the level detection unit to alter its gain, which results in compression of the audio signal. Unlike some designs, which simply have a valve in the circuit, a Vari-Mu compressor uses the valve for gain control. Hardware Compressor Types And Characteristics Tube (valve) compressors are more typically know as Vari-Mu. An in-depth analysis of the 1176LN's "personality" allowed Universal Audio to methodically reproduce those results within a plug-in architecture, and now offer that same character to computer-based audio workstations. Originally designed and built during the 1960's, the 1176LN was the first to use a field effect transistor (FET) as a voltage-controlled variable resistor, and that innovation was the key to the product's unique character. As the plug-ins are based on the music production community, the more users that input terms, the more representative the effects become for everyone else.The reputation of this analog classic is well known throughout the audio industry. Similarly, if you achieve an effect that can be explained in semantic terms, input it into the box and hit save. This means you can now control your audio effect plug-ins using terms that normal human beings can understand! Just type a term (such as warm, bright, etc.) into the text-box, and if we have it on our server, your parameters will be moved around to represent this. One of the main outcomes of the project is a suite of DAW plug-ins that allow you to both save and load semantic terms from within the audio production workflow. The SAFE Project is motivated by the lack of statistically-defined transferable semantic terms in music production and the requirement for more intuitive control of low-level parameters. The more people who upload descriptors to the server the better the downloaded plug-in settings will get. Users will be able to load plug-in settings by typing in descriptive words of how they want the audio to sound. All this information can then be used to create a series of `semantic plug-in settings'. This data is collected from all the users and analysed to give a general synopsis of what types of sound a given descriptor is used for. The plug-in then analyses the audio and saves the data to the SAFE server. ![]() ![]() ![]() The SAFE plug-ins are a series of audio plug-ins which allow the user to provide timbral descriptions of the audio they are processing with them. SAFECompressor is a semantic compressor, it can load settings by typing descriptive words.
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