Boss is a manufacturer of electronic musical instruments and accessories based in Asia. The business is a subdivision of Roland, one of the major producers of musical instruments in the world. Over the years, Boss has released a number of popular products, ranging from guitar distortion throtle to drum machines and samplers. One of its most enduring products, which is still widely used today despite having been first released over two decades ago, is the SE-50 multi-effects processor.

The SE-50 was the first half-rack multi-effects processor created by Boss and was especially designed with guitarists in mind. The effects unit is outfitted with an variety of effects typical of such units, including bias, chorus and flanger. Unconventional, however, is the Review processors addition of a 7-band digital vocoder. In total the unit offers 28 pre-specified algorithms, nine of which are reverb-only effects.

Even though the Employer SE-50 was actually conceived as a guitar multi-effects processor, in recent years it has gained popularity among many harsh EBM groups. These musicians use the unit's pitch shifter effect to process vocals both live and on songs. The SE-50's pitch shifter (patch 112), offers four frequency bands, each of which may be detuned independently. This effect, and by file format the SE-50 itself, is at a define the processed words of a number of modern electro-industrial bands. Widely-used settings include pitching the top two frequency bands up one to two semitones while at the same time detuning the lower bands by a similar amount. This is then combined with vocal styles similar to those used in some varieties of extreme metal, such as high or low-pitched screams and growls.

Users should take note that the SE-50 stores presets using an internal battery, similar to those found in watches and other electronic devices, which has a lifespan of less than several years. When this energy supply fails, which is to be anticipated due to the SE-50's age, all user-defined parameters will go back to factory presets. Exchanging the battery will recover the SE-50's ability to save lots of user presets, though options which were not stored on an external backup system may well not be retrievable.

Despite the unit's shortcomings, the fact that it is widely obtainable at prices less than $100 has ensured its widespread use among various guitarists and electronic musicians. Bands that contain used the SE-50 include Nine Inch Nails, Duran Duran, Kraftwerk,: wumpscut:, Information Society, Suicide Commando, Die Krupps, Grendel and Tactical Sekt.