I am not able to say, what oxygen exactly is. The core of the code is a failed attempt to make a saw-waveform in pd.
oxygen is pseudo-polyphonic somehow. It plays chords consisting of four single tones. But the concept is not to control every tone separately, but to have six instances. In each instance you can change all settings independently from the other instances. Like this you can create six completely different sounds. Of course you only can trigger one instance at the time.
With the first three sliders you can manipulate the timbre of the sound. The next group of sliders controls the amplitude envelope. When duration time elapsed, then release takes action.
In the next section you set the pitches of the four oscillators, for each oscillator one radio to set the tone, one to set the octave. There is no possibility to mute a tone yet.
oxygen is sequenced by qseq3.