Extreme uses samples/waveforms as the oscillator source. In addition, there's an ensemble section which can multiply the oscillator source into 6 different oscillators, which gives Extreme a very thick and punchy sound.

The waveforms/samples can be categorized as distorted, big, punchy, noisy and wicked, appealing to musicians who need a unique tool which sounds different compared with the average software synthesizers on the market.

Extreme features one resonant lowpass filter per voice. And there's a traditional amplitude envelope as well. And pitch modulation (LFO). There's a stereo delay (one for the left and one for the right stereo channel). In addition, Extreme includes an ensemble unit which multiplies the oscillator into six oscillators which can be detuned (the amount control) and mixed with the original voice.