In short, the System-1 has two oscillators to produce sounds.
In a mixer the sounds of the 2 oscillators can be mixed with a sub-oscillator and a noise generator; a filter-section puts an ADSR envelope (Attack, Decay, Sustain, Release) to the sounds.
An Amp-section can influence the volume output, using an ADSR envelope too.
As with the other Aira products, the System-1 has a Scatter function, which can reform the sounds to more variations.
This article relating to electronic musical instruments is a stub.