The A-177 is for connecting two foot controllers and one double foot switch to the A-100, for control of functions with your feet (e.g.VCF frequency, loudness, modulation depth, phasing, pitch).
For each foot controller the input scale can be adjusted with a knob at the front panel. 4 outputs and 4 LEDs for CV1, CV2, Gate1, Gate2.
A special application of the A-177 is the usage within a Trautonium replica (for details refer to the Trautonium project article).
The foot switches can be used to switch the mixtures of the subharmonic oscillator A-113.
The foot controller can be used to control the overall loudness in combination with a VCA.
