The Roland Juno-106 was a hybrid digital/analogue polyphonic synth manufactured by Roland Corporation

Roland Corporation

is a Japanese manufacturer of electronic musical instruments, electronic equipment and software. It was founded by Ikutaro Kakehashi in Osaka on April 18, 1972, with ¥33 million in capital. In 2005 Roland's headquarters relocated to Hamamatsu in Shizuoka Prefecture. Today it has factories in Japan,...

 in 1984. It featured Digitally controlled oscillators (DCOs) for tuning stability and digital envelope generation along with analog filters and signal path.
The Roland Juno-106 was relatively simple in terms of its synthesis architecture.

The central tone-generating component of the instrument is a set of 6 digitally controlled oscillators capable of producing sawtooth and square/pulse waveforms. The Juno is well known for its -24dB/octave analog lowpass filter with adjustable resonance

Resonance

In physics, resonance is the tendency of a system to oscillate at a greater amplitude at some frequencies than at others. These are known as the system's resonant frequencies...

, which has been said to provide the Juno 106 with its rather distinctive sound, when combined with the tone of the MC5534 wave generation modules.

The 80017A VCF/VCA (voltage controlled filter, voltage controlled amplifier) module contains circuits common to other Roland machines (IR3109 and BA662).