ARP Little Brother Excellent condition. It’s a really cool ARP synth expansion module but can be used with any analogue synth since it has cv control.
From Wikipedia: he ARP Little Brother, produced from 1975 to 1977, is a keyboardless monophonic expander module,[2] sold as an add-on for another ARP synthesizer. It was controlled by connecting the control voltage (CV) output of an ARP synthesizer's keyboard to the Little Brother's CV input. Little Brother Manufacturer ARP Instruments, Inc. Dates 1975 - 1977 Technical specifications Polyphony Monophonic Timbrality Monotimbral Oscillator 1 square[1] LFO 1 triangle Synthesis type Analog Subtractive Filter None Storage memory none Effects none Input/output Keyboard none External control CV/Gate, ARP system interface The Little Brother had a single voltage controlled oscillator (VCO) with selectable waveforms, and a sub-octave divider that could produce up to three additional tones simultaneously at -1, -2 and -3 octave intervals. It also had an LFO, and a pitch bend/master tuning knob. However, it had no voltage controlled filter (VCF), voltage controlled amplifier (VCA) or envelope generator (EG or ADSR). When used with other ARP synths to "fatten up" their sounds, the Little Brother's audio output had to be patched into the external audio input of its companion synthesizer, essentially adding an extra VCO and LFO to the system. It was commonly sold with the ARP Axxe, and was given away for free with the purchase of an ARP Odyssey during a summer 1976 promotion. However, it could be used with any analog synthesizer that had the necessary 1v/octave CV output and external audio input connections.
From Synthmuseum.com:
his is a strange piece, probably the strangest ever built at ARP. It consists of a single VCO, but with organ-style divide down and wave shaping circuitry. The divider only makes the same noteas the VCO is sounding. No intervals. Thus, whatever voltage you use to make the VCO make a pitch, you get that pitch (2'), and the next three octaves down (4', 8', 16'), all available at the same time, like an organ. Furthermore, there are four waveforms available: Sawtooth, Square, Pulse, and PWM, and these are available at the same time, too. Moreover, when you turn on the sawtooth and square waves and the 2' and 8' octaves all at the same time, you really do get a 2' saw, a 2' square, an 8' saw, and an 8' square, all at once! They're all phase-locked to each other because of the dividers, but if you beat them against the other VCOs in your synthesizer, it can sound really fat.
