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How to reproduce Roland Alpha Juno style PWM Sawtooth wave with Elektron Analog Four.

2/9/2022

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Picture

Another PWM for Analog Four


Roland Alpha Juno

Roland Alpha Juno was released in 1985, and is a 6-note polyphonic synth with 1DCO. While regular synthesizers can pulse-modulate square waves, Alpha Juno can also be applied to sawtooth wave. Synthesis method is different from Analog Four's PWM sawtooth wave. 
Alpha Juno's PWM sawtooth wave is famous for creating the Hoover Sound.

Analog Four Settings

Picture
Picture
Amplitude Modulation and PWM
  • OSC1 - TUN = 0, Wavform = Tri, PW = 64
  • OSC2 - TUN =12 , 24 or 36, Waveform = Pulse, LEV = 0, PW = 64
  • OSC COMMON - AM1 = ON, Trig = ON​, Oscillator Drift = OFF
With this configuration, we can reproduce Alpha Juno style sawtooth wave PWM by manipulating  OSC2 PW.
The point of this synthesis method is that the frequency ratios of the two oscillators are integer multiples and the phases are synchronized.

Sounds

This is a sound that utilizes this synthesis method.

A4 Mod Drum Patch Pack[$13]

kimura taro · A4 Mod Drum Patch Pack[Hoover Sounds]
Download

PWM Saw of Analog Four

The original Analog Four PWM sawtooth wave is generated by rotating the same two waveforms in opposite directions. The overtones interfere with each other, resulting in a chorus or phaser-like sound.
Example in Ableton Wavetable
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