MATRIXSYNTH: Roland IR3109 VCF Showdown: JUNO-6, JU-06A, JX-3P sonic traits compared

Monday, June 14, 2021

Roland IR3109 VCF Showdown: JUNO-6, JU-06A, JX-3P sonic traits compared


video by thesrabbit

"This video features several filter sweeps at full resonance, which means there will be very high frequencies at high volumes. Please exercise caution while watching and listening!

Contents:
0:00 Intro
0:27 Init Sounds
1:01 Sub Oscillator
2:06 Filter Sweeps (and copyright claims smh) 0% resonance
4:28 Filter Sweeps 50% resonance
6:45 Filter Sweeps 100% resonance
9:52 Envelope Filter Sweeps at full resonance and 100% key follow
14:42 Arp/Seq Saw+Sub Envelope to VCF only, Key Follow 100% - ENV Decay Sweep from max to min
19:26 Arp/Seq Saw+Sub Envelope to VCF and VCA, Key Follow 100% - ENV Decay Sweep from max to min
24:08 Arp/Seq Saw+Sub Envelope to VCF and VCA, Key Follow 0% - ENV Decay Sweep from max to min
29:02 Arp/Seq Saw+Sub Envelope to VCF and VCA, Key Follow 50% - ENV Decay Sweep from max to min
34:04 Arp/Seq ENV Attack
38:39 ENV Release Time, Key Follow 100%
41:30 Manual Pulse Width
43:35 LFO PWM
47:26 Chorus
51:43 4-note polyphony, max envelope times, 100% resonance, 100% key follow, sawtooth
53:34 4-note polyphony, max envelope times, 100% resonance, 0% key follow, sawtooth
55:13 4-note polyphony, max envelope times, 100% resonance, 50% key follow, sawtooth
57:07 4-note polyphony, max envelope times, 100% resonance, 100% key follow, square wave

In this video, I present a (very long) comparison of three synths from Roland: JUNO-6, JU-06A, and JX-3P. All three of these use the same legendary IR3109 analog VCF chip. In the case of the JU-06A (JUNO-60 digital recreation) this VCF chip is modeled with Roland's ACB tech. My JX-3P has about a 30% resonance boost, which brings it closer to JUNO territory. A JX-3P from the factory has very mellow resonance that doesn't really even squelch. Anyone with a JX-3P can perform this "mod" as no special skills are required (see link below to my vid where I did this).

This video will probably benefit me more than anyone else, but who knows? Some may find it interesting or useful. The goal here is to compare and discover differences and similarities between these synths when it comes to key sonic traits, such as: the sound of the filter at high resonance, filter key follow behavior, envelopes, VCA (in gate mode and envelope mode), Chorus, and Pulse Width. If that sounds boring, feel free to move along to a channel that does more lively comparisons. There are plenty of good options out there! I may do a patch comparison at some point down the road.

There is no talking in this video. I don't want to sway anyone's opinion with my commentary. Rather, it is just a simple presentation with visuals and on-screen text to indicate what's going on. I did my best to match the settings for each sound. Feel free to let me know in the comments if I screwed something up.

Lastly, any additional noise and hiss beyond the innate noise of the chorus circuit is totally my fault. I had 2 other inputs cranked on my mixer unnecessarily.

Enjoy!

JX-3P filter resonance boost:" [posted here]

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