Ultramaster KR-106, new free Juno 60 emulator!

cfausto · March 28, 2026, 1:26pm

hi @hannesmenzel. I was attempting to explain that the plugin is working and the presets show up, but not the synth parameters (below Midi Controllers in the chain page), although I tried to normally update and also tried to place the correct dsp.ttl in the right place. So I wondered if some aditional procedure (running a script or something) is needed beyond placing the file in the right place. @riban hinted me about possibly having more than 1 plugin instance, since I also built it from source, but I am away and couldn’t investigate it yet.
Thank you!

cfausto · March 28, 2026, 4:57pm

Bingo @riban. Somehow, in my early attempts to build it, I created a copy of the plugin inside /zynthian/zynthian-my-data/presets/lv2/Ultramaster KR-106.lv2. Zapped it, reboot and voilà.

Thanks a bunch, it’s a good feeling to figure a tiny bit more of this big picture

jofemodo · March 28, 2026, 8:23pm

Curious. This happened to me twice in the latest weeks with different plugins. I’m starting to think there is some piece of code somewhere that creates these copies under some circumstances.
Let’s keep our eyes open regarding similar issues …

Cheers

jofemodo · March 29, 2026, 3:59pm

Hi @kayrockscreenprintin !

I’ve been trying to integrate the latest ARP parameters in the zynthian UI, but i can’t find the new parameters in the LV2’s TTL definition.

Please, could you make available in the LV2 TTL definition the latest changes in arpegiator?

Thanks!

hannesmenzel · March 29, 2026, 5:28pm

The question is if they can appear in the ttl as long as they aren’t parameters but probably internal variables?

github.com/kayrockscreenprinting/ultramaster_kr106

Source%2FPluginProcessor.h

main


      
          enum EParams
          {
            kBenderDco = 0, kBenderVcf, kArpRate, kLfoRate, kLfoDelay,
            kDcoLfo, kDcoPwm, kDcoSub, kDcoNoise, kHpfFreq,
            kVcfFreq, kVcfRes, kVcfEnv, kVcfLfo, kVcfKbd,
            kVcaLevel, kEnvA, kEnvD, kEnvS, kEnvR,
            kTranspose, kHold, kArpeggio, kDcoPulse, kDcoSaw, kDcoSubSw,
            kChorusOff, kChorusI, kChorusII,
            kOctTranspose, kArpMode, kArpRange, kLfoMode, kPwmMode,
            kVcfEnvInv, kVcaMode,
            kBender, kTuning, kPower,
            kPortaMode, kPortaRate,
            kTransposeOffset, kBenderLfo,
            kAdsrMode,
            kMasterVol,
            kNumParams
          };

jofemodo · April 1, 2026, 10:43am

Now all options from the “settings” menu are integrated in the zynthian UI. These include:

Voices: 6, 8, 10
VCF Oversample: x2, x4
ARP Sync to host: on/off
LFO Sync to host: on/off
Ignore MIDI Velocity: on/off
Limit ARP to keyboard range: on/off
Mono Retrigger: on/off
MIDI SyseX: on/off

Simply update (Vangelis) and enjoy!

Thanks @kayrockscreenprintin for making these accessible as LV2 parameters!

Regards!

Nicolaz · April 7, 2026, 8:07am

How to make the mod wheel pitch in a keyboard controller work?

riban · April 7, 2026, 8:26am

Hi @Nicolaz.

Do you mean that a hardware ptichwheel does not bend the pitch of the KR-106? This relates to how the patches are built. It seems they do not by default link the pitchwheel to the VCO pitch. This can be done by changing the value of the “Bender DCO” control (currently on params 13 page).

Nicolaz · April 7, 2026, 8:43am

Yes, i tried but i have no results. Changing “Bender DCO” value seems useless. Only the “Bender” control is working, and i can assign it to the mod wheel but it’s not as the same as the pitch wheel, of course.

riban · April 7, 2026, 8:47am

Okay - so you assign some bend range to DCO which means the pitchbend will adjust pitch. Now you want to assign CC1 mod wheel to control this. MIDI learn “Bender” to the mod wheel (CC1).

Nicolaz · April 7, 2026, 9:04am

Ok, seems like the problem was in my Arturia Keystep. Worked in Akai Mini Plus so i did a reset on the Arturia and now it’s ok. Thanks!

hannesmenzel · April 15, 2026, 5:50pm

In our rehearsal yesterday I noticed that for me in the current version preset load doesn’t update all the parameters. Pretty sure the portamento type is among them.

Are there probably old patches left anywhere which do not include the newly presented plugin parameters or so?

Other than that this synth got band approved yesterday.

Nicolaz · April 16, 2026, 8:55am

I too have noticed strange patches behaviors. I’m again having problems with bender and I have the impressione that some sounds have slightly changed after updates. I guess this is more or less normal considering that develpers are improving the engine very often.

hannesmenzel · April 16, 2026, 12:41pm

At least I can confirm that regeneratng the presets for that plugin before reboot does not resolve the issue.

Also I made an Init patch, and after selecting this one all other presets sound different. I assume these issues are related.

PS: I noticed the presets only have 44 values stored while the current plugin version has 55 parameters:

github.com/kayrockscreenprinting/ultramaster_kr106

Source/KR106_Presets_JUCE.h

ad6f40179


      
          
          struct KR106FactoryPreset {
              const char* name;
              int values[44];
          };
          
          static constexpr int kNumFactoryPresets = 256;
          
          static const KR106FactoryPreset kFactoryPresets[] = {
              // === J6 Bank (0-127): Juno-60 tape dump patches ===
              {"A11 Strings 1", {0, 0, 0, 56, 0, 0, 0, 0, 0, 0, 88, 0, 0, 0, 127, 65, 75, 0, 127, 83, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A12 Strings 2", {0, 0, 0, 29, 0, 0, 74, 0, 0, 0, 88, 0, 0, 0, 127, 36, 75, 0, 127, 83, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A13 Strings 3", {0, 0, 0, 25, 125, 0, 97, 127, 0, 0, 66, 0, 0, 0, 127, 42, 60, 0, 127, 97, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A14 Organ 1", {0, 0, 0, 19, 0, 0, 64, 127, 0, 0, 49, 83, 55, 0, 127, 59, 2, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A15 Organ 2", {0, 0, 0, 37, 87, 0, 70, 105, 0, 0, 43, 66, 48, 0, 127, 64, 2, 12, 0, 10, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A16 Organ 3", {0, 0, 0, 37, 87, 0, 70, 105, 0, 0, 39, 66, 41, 0, 127, 65, 2, 12, 0, 10, 0, 0, 0, 1, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A17 Brass", {0, 0, 0, 37, 109, 11, 0, 0, 0, 0, 0, 0, 116, 0, 46, 89, 57, 79, 73, 42, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A18 Phase Brass", {0, 0, 0, 57, 0, 0, 127, 127, 0, 0, 33, 4, 70, 0, 127, 55, 49, 83, 53, 68, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 1, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A21 Piano 1", {0, 0, 0, 48, 68, 58, 79, 0, 0, 0, 4, 0, 91, 0, 47, 95, 2, 112, 10, 65, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A22 Piano 2", {0, 0, 0, 30, 0, 0, 56, 56, 0, 0, 43, 0, 27, 20, 103, 103, 2, 110, 0, 76, 0, 0, 0, 1, 0, 1, 1, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},
              {"A23 Celesta", {0, 0, 0, 27, 105, 0, 60, 127, 0, 1, 44, 106, 0, 0, 127, 76, 2, 99, 17, 92, 0, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 0, 1, 2, 0, 0, 0, 0}},

github.com/kayrockscreenprinting/ultramaster_kr106

Source/PluginProcessor.h

ad6f40179


      
            kSettingVoices,       // 6, 8, or 10
            kSettingOversample,   // 2 or 4
            kSettingIgnoreVel,    // bool
            kSettingArpLimitKbd,  // bool
            kSettingArpSync,      // bool
            kSettingLfoSync,      // bool
            kSettingMonoRetrig,   // bool
            kSettingMidiSysEx,    // bool
            kArpQuantize,         // 0-8 note division (separate from kArpRate for headless/DSP use)
            kLfoQuantize,         // 0-12 note division (separate from kLfoRate for headless/DSP use)
            kNumParams
          };
          
          class KR106AudioProcessor : public juce::AudioProcessor
          {
          public:
            KR106AudioProcessor();
            ~KR106AudioProcessor() override = default;
          
            void prepareToPlay(double sampleRate, int samplesPerBlock) override;
            void releaseResources() override {}

This might be related. I reported that upstream.

Nicolaz · April 20, 2026, 3:28pm

Here’s a track I made to experiment with Ultramaster. There are 8 parts with different sounds, plus two Fabla drum parts. I used effects in some part: delay, reverb and panning. Everything came from Zynthian and there’s no mastering. I like the result and I hope I was able to balance all the different sound. Thanks to @kayrockscreenprintin and all the developers for the emulator!

The title of the song is “Sprammagamma”. Spramma means “fear” or “fright” in sardinian language. Gamma… is a tribute to Alan Parsons Project

jofemodo · April 20, 2026, 3:50pm

OMG!! You exhausted the chars for phrases, from A to Z.
Amazing trip, @Nicolaz !! I enjoyed a lot listening, special kudos for the transition from Q to R and the flying leads in V and W to reach the end. Congrats mate!!

I see you don’t use phrase loops (repeat from, etc.) nor parameter automation. Perhaps in your next piece

BTW, automating panning with Fabla is super-cool. You can pan each sound separatelly and get very dynamic effects. You could also try to add panning automation to any synth line.

All the best!

Nicolaz · April 20, 2026, 6:31pm

Thanks! About phrase loops, repeat, etc., the idea for this track was to experiment expecially with Ultramaster, and secondary with Vangelis. Apart from this, I didn’t use complex automations because every recurring phrase has some difference from the original one, so the A to Z structure was the best in this case.
About panning automation, i used panning effects. I will experiment with automation parameters in sequences for sure.
Anyway, the track is, as usual, a draft (an almost definitive one).
And… this is the snapshot.

034-Sprammagamma.zss (391.6 KB)

jofemodo · April 21, 2026, 11:49am

Nice! The snapshot works perfectly OK in my V5, although i had to disable VNC to avoid spurious XRUNs.

hannesmenzel · April 21, 2026, 3:56pm

Turned out this is indended behaviour.