The expansion module, designed to function together with the "older brothers". It doesn’t have its own keyboard, VCF, VCA, on board - only one VCO and LFO.
According to the manufacturer's idea, this module should be integrated with, for example, ARP Axxe via the CV interface, and the audio output of the "brother" - connected to an external signal input in Axxe. Thus, the signal goes through further processing (VCF, VCA) thanks to the "big brother".
It would seem that one voltage controlled oscillator can’t give a lot, but there is a special trick: Little Brother uses the method which was inherent in electric organs of that period, and allows you to get several notes from one oscillator at once. But unlike the organs, the module uses a monophonic even method, which allows you to get notes one, two and three octaves below the main one.
Four types of waveform are available:
Saw - "Brass".
Three types of square wave, differing in the duty cycle - "Hollow", "Reed" and "Fuzz".
Thus, the module can supplement the sound with one note simultaneously produced in three different octaves with four types of waves.
In addition to this, the module has its own independent LFO for sculptingg a vibrato effect and a pitch bend controller with a range of adjustment within +/- octave.