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The ARP Little Brother , produced from 1975 to 1977 , is a keyboardless monophonic expander module , sold as an add-on for another ARP synthesizer .. expander module. Sound module. ARP. ARP Instruments, Inc.. synthesizer. synthesizer. It was controlled by connecting the control voltage -LRB- CV -RRB- output of an ARP synthesizer 's keyboard to the Little Brother 's CV input .. ARP. ARP Instruments, Inc.. synthesizer. synthesizer. The Little Brother had a single voltage controlled oscillator -LRB- VCO -RRB- 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 .. LFO. Low frequency oscillation. However , it had no voltage controlled filter -LRB- VCF -RRB- , voltage controlled amplifier -LRB- VCA -RRB- or envelope generator -LRB- EG or ADSR -RRB- .. 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 .. ARP. ARP Instruments, Inc.. synthesizer. synthesizer. LFO. Low frequency oscillation. 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 .. ARP. ARP Instruments, Inc.. ARP Axxe. ARP Axxe. ARP Odyssey. ARP Odyssey. However , it could be used with any analog synthesizer that had the necessary 1v / octave CV output and external audio input connections .. synthesizer. synthesizer