The A-113 produces four subharmonics, and is based on Oskar Sala’s Mixtur-Trautonium. A subharmonic means in this context a sawtooth wave, whose frequency is derived from a master frequency and the master frequency is an integer multiple in the range of 1...24 of the subharmonic - in other words: the master frequency is divided by an integer 1...24 to obtain the subharmonic. Note that the output waveform of a subharmonic is a sawtooth.
The master frequency comes typically from a VCO. The frequency dividers of the 4 subharmonics is adjusted with up/down buttons as displayed with 2 character LED displays, these outputs are output individually with level control and a mixed output.. Two gate type control inputs enable to select between 4 different mixtures, i.e. 4 different settings of the frequency dividers. Additionally the A-113 features a mixture memory with 50 presets. Each preset consists of 4 mixtures that can be selected with the gate inputs, each mixture contains the values of the 4 frequency dividers.