[sdiy] Roland Juno 106

[Gordonjcp]

On Sat, Feb 10, 2024 at 04:42:08PM -0800, brianw wrote:
> What's "the digital part"?
> 
> I assume you're not referring to the 'Digital' part of the DCO, which you referred to as boring, although the digital master clock could have a significant affect on the sound.
> 

No, the DCOs and filters are pretty boring and ordinary. I'm talking about the microprocessor that runs the voice card.

> There's no need to 'clone' the firmware, since that digital aspect doesn't really affect the sound.

Okay, so you're saying that the way the control ranges interact, the way the envelopes work over particular ranges, and the way the LFO works - and the way that is all mixed together to control the oscillators and envelopes - you're saying that this "doesn't really affect the sound"?

That's an interesting take on it.

> I'm just curious what you're saying has yet to be reproduced with modern technology...

Nobody seems to really understand what the voice CPU is doing, so they try to "improve" it. This is nothing short of disastrous. If you compare the JU-06 to a real Juno 106 for example, it doesn't sound anything like the "real deal" because it just doesn't get the envelopes even close to correct.

That's leaving out all the "higher order effects" like the inherent wobblyness that the LFO has, the variation in the envelope times, and so on. There's a lot going on in that 2kB of code and 1.5kB of lookup tables.

-- 
Gordonjcp