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Demo :
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Utility Files :
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Additionnal demos :
Starting with a simple idea....
I always was interested in the Juno series from Roland. I had a Juno-106 back in the day and liked its sound and simplicity.
I made a mistake by selling it when going mostly digital and regret it later. After a few years, i hesitated buying a Juno-6 or Juno-60 when they were still affordable.
I should have bought one because today, the price has gone so high !
I made a mistake by selling it when going mostly digital and regret it later. After a few years, i hesitated buying a Juno-6 or Juno-60 when they were still affordable.
I should have bought one because today, the price has gone so high !
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Recently, while checking the guts of the Junos on several websites, i was able to see how the famous DCO was working and wondered if, with the DSP tools of the K2700, i would be able to make a kind of simulation of this oscillator. Here we go ! After noodling with VAST, i was able to start with a square wave, and with some waveshaping, make a sawtooth and a pulse with PW / PWM one octave upper. So, if the original DCO was made with a core sawtooth and waveshaping to make the PW/PWM and a flip-flop for the Sub, i took the challenge another way round starting with the square (finally the sub), and it worked !
Because all waveforms are coming from the same source, everything is rock-solid in phase, and that's the key ! When the basis of this project were finalized, i could start the other programming parts of DCO MADNESS ! |
Roland Juno-60
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Vol.1 'Back To the Root'
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With this first set, the goal was to propose to the user a maximum of direct functions, based on the ones found on the original Junos. The K2700's front panel allows to assign any functions to the hardware controls, so i tried to match the original parameters. Yes, the bass boost of the HPF of the 106 is here too if this setting is set to zero ! Like the original instrument for example, you can control the PW / PWM source with a dedicated button, and then adjust the depth with a fader. I added the ability to switch the synth to a monophonic playing mode, with a dedicated portamento setting. I made two versions of 'Ju-On 60'. One with no velocity to match the raw response of the original instrument, and another version which responds to velocity on filter and amplitude, called 'Ju-On 60 V' You can check the parameters panel just below. |
JU-ON 60 Parameters
Vol.2 'Variable Oscillator'
Vol.2 'Variable Oscillator'
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With 'Ju-On 60', based on the Roland juno-60, you can already make quite a number of sounds, despite its lack of numerous parameters. But i thought it could be interesting to go a bit further by making other waveshaping on the sawtooth and always stay in phase ! I developped for this task two other simple 'models', a hard sync simulation and a phase-like effect. Each of this effect can be controled by a fader for the depth of shape modulation (by the envelope), and a switch to add a LFO. There are room for other 'models' later... You can note that this is no longer a 'Pulse Core', but a 'FM Core' synthesizer ! Meaning the original square wave is replaced by...a FM operator. I added another LFO, but this one can go to audio range and you can go into really fast modulations. That's why i used a FM operator for this task.... You can notice a few parameters had to move as the goal was to stay as direct as possible but i added the ability to switch from a Low Pass Filter to a Band Pass Filter, which greatly enhances the sonic range. |
JU-ON 60 Xpanded Parameters
JU-ON 60 Xpanded Parameters
Vol.3 'Sample Playback Ahead'
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This last part adds the sample playback ability. After playing with the previous variable oscillator 'models' i then wondered if a sample would work in this project. I tried with a few keymaps and realized that some of them worked really well ! I took this opportunity to make a few changes. The sub oscillator and the PW/PWM will stay unchanged but the sample playback function will add a few parameters. Now we have a selectable ring modulator and the ability to adjust from 0 to 700 cts the frequency of the samples. Also the coarse frequency of the sample is not affected by the Octave Transposition function. Why ? Because we have now more sonic possibilities by adjusting the frequency of the 'Core FM' oscillator two octaves below the sample, one octave lower or the same octave, and at the same time, the PW/PWM is always one octave upper. With our without the ring modulator and the sample frequency adjust, you can have easily some really interesting results. And because it's sample playback, you can put here what ever you want ! Please note that you can modulate the frequency of the sample only by LFO 2. It's not affected by LFO 1, therefore the modwheel. |
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< Inserting / modifying the keymap I tried to make the things as easy as possible. To change / adjust the keymap used, you just have to edit the first layer and make your changes.
You can transpose your keymap, change the keytracking, etc... For example, in some presets i changed the playback mode. Some creazy things can be done, so explore ! |
JU-ON 60 Xpanded / Sampling Parameters
JU-ON 60 Xpanded / Sampling Parameters
Additionnal Informations :
Finding the sounds in your instrument
All the sounds of this set have a specific name, based on the model they have been made from. It's more convenient to find them in your memory slots.
In the two examples below, you can see that program 1031 'CrackedRok' has been made from the Xpanded Sample model, and program 1085 'Pop Land' has been made from the Ju-On 60 model.
In the two examples below, you can see that program 1031 'CrackedRok' has been made from the Xpanded Sample model, and program 1085 'Pop Land' has been made from the Ju-On 60 model.
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5 INITS programs has been created, you can start from scratch using one of them.
- JN60 / INIT
- JN60V / INIT
- JNS / INIT (Sample)
- JNX / INIT (Phase)
- JNX / INIT (Sync)
Fine tuning / editing of the parameters
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You have a precise adjustment of your parameters if you go in the parameter page. You can also expand in a way some functions. For example some waveforms can be switched ON/OFF with buttons on the front panel. In the parameter page if you type alternate values you can adjust the volume of this waveform. So it's like having an additionnal mixing function. |
Thanks for reading this page, and i hope you will have fun using this product !
Programming and demos by Stephane 'Barb' Garganigo Copyright (C) 2023
