22/2/2016 How to achieve PWM on Roland’s SuperJV / XP and XV series | donsolaris.com

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Posted by : Don Solaris On : March 22, 2014 0

Category: rolandTags: jv1080, roland

How to achieve PWM on Roland’sSuperJV / XP and XV series

Compatibility: JV­1080 and upAudio example: PWM.mp3The super JV series features two saw waves that have inverted amplitude to each other. A little

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The super JV series features two saw waves that have inverted amplitude to each other. A littlebit of math shows us if we play them both, we will get silence at the output, but if we detuneone of them, we will get Pulse Width Modulation. Basic procedure:

Initialize the sound.Turn on T1 and T2.Go to WG1, and select ‘Synth Saw 2’Go to WG2, and select ‘Syn Saw 2inv’

Ok, now we got the basic setup. Next thing is to create detune. To avoid the modulation soundexactly the same each time we play the note, we will create detune by using Random Pitch.

Set Random Pitch on WG2 to: 1

Now we must be careful here, because random means sometimes 0 at the output, and thatwould result in no detune = silence. To prevent this we will add Fine Tune which must be at least+2. Why? Because there are two possible cases. In case a) random gives 0 at output, Fine Tuneof +2 preserves non zero value (it will be +2). In case b) random gives ­1 at the output, FineTune of +2 again preserves non zero value (total fine tune will be +1).

Set Fine Tune on WG2 to: +2

I assume most people would use PWM for the bass, therefore:

Set Coarse Tune of WG1 and WG2 to: ­12

You will notice the sound plays very slow pulse width modulation. To give more expression wewill add one controller to modify the pitch of one oscillator. Please be careful here. You can’tassign this modulator to ‘any’ Tone you desire. It must be the tone that we applied detunefunction. In our case, this would be the Tone 2.

Go to PATCH LFO&Ctrl #1 (Matrix Control)Matrix Control 1 Source set to CC01: MODULATIONAs Destination set PITCH, and put +6 to Sns (sensitivity)Disable Tone1 within matrix to make it look like this: PITCH : +6 ­> _ooo

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Set TVA as necessary

Now when you move Modulation Wheel up, you will fasten the Pulse Width Modulation. If youwant faster PWM by default, put higher values at WG2 ”Fine Tune”. And that’s about it!

By three methods we may learn wisdom: First, by reflection, which is noblest; Second, byimitation, which is easiest; and third by experience, which is the bitterest. – Confucius

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