Analogue
From DNBWiki
Analogue, or Analog, depending on your spelling preference, is the term used to refer to a circuit or piece of equipment which treats and operates on the audio signal as a continuously variable voltage level over time; compare this to digital equipment which represents the audio signal with a fixed number of bits.
Analogue audio circuitry has many particular characteristics which can make the sounds it produces prized and sought. It is often described as "warmer" or "fatter", and filters are the most obvious place to start listening if you wish to hear the difference. These distortions are non-linear in nature, and therefore are often prohibitively expensive to emulate using digital technology.
Analogue audio circuitry also has many disadvantages. Unlike digital signal processing, analogue signal processing is prone to interference. It is also usually more expensive.
