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3. Using voice detuning to create an analogue polysynth
1 Diva’s Trimmers tab provides access to each voice, allowing us to modify the tuning and other properties. We can use this amazing feature to create an authentic sounding analogue polysynth. Create a MIDI channel, load Diva and select the INIT Jupe-8 template. Start by lowering the master Output to 50 to give us some headroom to work with.
2 Kick things off by changing VCO 1’s waveform to a pulse and dropping its tuning to 16'. It’s too bright sounding, so drop the filter Cutoff slider to 105. This sounds smoother, but the higher notes sound too dull. Move the KYBD slider up to 35 to bring them out – this is known as filter keytracking. To get the filter moving a bit, turn up the LFO 2 dial to 14.
3 The filter’s moving a bit too fast, so turn LFO 2’s Rate control to -4. Now head back to the filter and send it to the envelope by turning up the Env 2 control to 40. A slight envelope change will give a classic analogue attack to the sound, so set the sliders for both envelopes to: Attack 25, Decay 50, Sustain 40 and Release 50.
4 The Vel and Kybd sliders scale the envelope time in relation to velocity and MIDI note number – so the harder you hit the keys and the further up the keyboard you go, the quicker the envelope time becomes. This can make the patch much more expressive and playable. Put this into action by moving the Vel slider to 70 and the KYBD slider to 35 on both envelopes.
5 Click on the Trimmers tab to access the tuning functions. The quickest way to increase voice detuning is to turn up the Detune Amt control, so increase it to 50. Next, turn Voice Drift to max for some analogue pitch drift! Also in this section is the Voice Map Modulator. This is a separate, assignable modulation control for each voice. Alternate controls between -100 and 100, then return to the Main tab.
6 We can use our Voice Map Modulator settings to spread our sound throughout the stereo field. In the Amplifier>>Pan area, turn the Pan Mod dial to 50 then change the assignment box to the right from LFO2 to VoiceMap. This pans each voice either left or right. Finally, add effects by changing Effect 1 to Plate1, turn it on, then activate Effect 2 (Delay by default).