GUI design: adventures in Blender.

Your GUI looks very good - just like a Juno. But why are you using that particular ensemble to produce the audio?

There isn't any attempt there to model an actual Juno. Even something as fundamental as the oscillators. In a juno the oscillators are one per voice - no doubling, just a basic DCO (like a basic oscillator with some clock noise, jitter, and tuning inaccuracies). But that ens has every OSC doubled to 'fatten' it up. It sounds OK I suppose, but not even close to a Juno! And the chorus is also not close to the original. It has 2 delay lines per channel instead of 1! and that chorus is THE Juno 'thing'.

The ancient Factory legacy library 'juno' is much closer to the real thing. IIRC there was a zip with Reaktor at one point that contained all that old stuff... There is at least one Juno emulation in the UL based on that old factory implementation, the only thing it doesn't do well is the arpeggiator.

Kind of a shame to create a convincing looking GUI, then fill it with... that. How many folk will download it because of the looks, then assume the sound is the best that Reaktor can do?

...AFAIK, the best Roland clone in the UL is by Trial'N'Error, but it's a Jupiter remix, not Juno -hewever is does have a really good arpeggiator implementation. Jasper (Chrono) Broeks has a Juno 106 based on the old Factory ens, which is much better than the one you are using. Not sure if those guys are active these days, so getting permission to reskin might be tricky... but that old factory thing... maybe @Paule knows where the collection zip would be in the Reaktor install?