u-he Repro (Repro-1 & Repro-5) released

[EvilDragon]

Again, it is very likely how the original circuit behaves, and Repro is set to emulate that behavior.

[Cinebient]

It is simple. If Sylenth is what someone want....great. But Sylenth is so far away from Repro like mankind from peace on earth.

[fluffy_little_something]

Yes, it can do that. Filter saturation, as Urs said. It's a non-linearity in filter's feedback loop (which creates the resonance). Sylenth's filter is not non-linear AFAIK, so it's "squeaky clean" like that.

Did SCI intend that behavior or was it just another design flaw, like pitch drift and such aspects of old analog synths?

I don't like it at all, that's for sure. It takes the silkiness out of resonance sweeps.
But I could still get Repro as it sounds very nice with brass and bass sounds. I would simply have to keep resonance to zero when using pulse waves...

[fluffy_little_something]

Yes, it can do that. Filter saturation, as Urs said. It's a non-linearity in filter's feedback loop (which creates the resonance). Sylenth's filter is not non-linear AFAIK, so it's "squeaky clean" like that.

On the LD site it says "Each of these consists of 4 filter stages with nonlinear saturation incorporated."

But yes, it sounds rather different at the end of the day...

[dougb256]

Alright, peace on Earth! Or close to it anyway...

[SJ_Digriz]

All I can say is that the pro-5 could be brutally harsh. I wouldn't know to call it filter saturation, but you could definitely seem to overload the mixer fairly easily with even small amounts of rez. And this was not uniform across the range. It was noticeable primarily in the highs. I also probably wouldn't call it grinding .. but hey these kinds of words are hard to quantify. It always seemed like distorted ring modulation noise as pitches interacted to me. I just considered that to be part of the Curtis filter thing. But, again I'm an idiot when it comes to the architecture and actual cause. I just know that a pro-5 could easily get shrill enough to peel paint and shatter glass even within a more tame/sane patch simply by hitting a coincident chord that happened to excite the filter/mixer in a certain way.

[david.beholder]

All I can say is that the pro-5 could be brutally harsh. I wouldn't know to call it filter saturation, but you could definitely seem to overload the mixer fairly easily with even small amounts of rez.

I guess prophet 6 could be even harsher due to the same reasons.

[SJ_Digriz]

All I can say is that the pro-5 could be brutally harsh. I wouldn't know to call it filter saturation, but you could definitely seem to overload the mixer fairly easily with even small amounts of rez.

I guess prophet 6 could be even harsher due to the same reasons.

It's a little different, but same kind of result ... I have a guitar amp that loves Bb. It thinks Bb must be played 3 times as loud as any other note. All notes should be Bb. It took me forever to find that the mounting plate for one of the tubes was resonant to Bb. I always just assumed that the internals of the pro-5 had some mojo interactions between things that get out of hand if you aren't paying attention.

[EvilDragon]

Yes, it can do that. Filter saturation, as Urs said. It's a non-linearity in filter's feedback loop (which creates the resonance). Sylenth's filter is not non-linear AFAIK, so it's "squeaky clean" like that.

Did SCI intend that behavior or was it just another design flaw, like pitch drift and such aspects of old analog synths?

Don't look at SCI, it's Curtis (CEM) who designed those chips that SCI used. They pretty much stuck to the "reference design" that Curtis had for those chips.


In any case, I would not call this a design flaw.


Also one thing to note - the patch you mention has both oscillators set at full blast into the filter. THIS is what causes the filter to saturate. Try it with oscillator levels lowered (like, 40-70%, not sure when the mixer overdrive kicks in). Some analog filters are quite sensitive to the input level that is fed into them (most notable example being the MS-20).

[david.beholder]

It's a little different, but same kind of result ... I have a guitar amp that loves Bb. It thinks Bb must be played 3 times as loud as any other note. All notes should be Bb. It took me forever to find that the mounting plate for one of the tubes was resonant to Bb. I always just assumed that the internals of the pro-5 had some mojo interactions between things that get out of hand if you aren't paying attention.

Bb is so bluesy, you've just murdered blues in your amp

Well RePro still has harshness and it is integral part of sound I guess, that famous shshshshs on pads. I've talked to Urs over here about it and he also mentioned this pattern, but I RePro 5 has a more organic sound than P6.

Btw, I've sold P6 after direct comparison becuase I was very satisfied by sound of RP5 .

[SJ_Digriz]

In case it isn't clear, I'm not complaining about RP5 in any way shape or form. I think it's great.

[braj]

I do think it is interesting that we have people now complaining that a softsynth sounds too much like the hardware it emulates

[db3]

Btw, I've sold P6 after direct comparison becuase I was very satisfied by sound of RP5 .

P6 has a discrete SSM based filter doesn't it?
I'm assuming Repro is modelling P5 rev3 Curtis and not the nicer P5 rev2 SSM. Even so, Repro-5 seems much less harsh than my Rev2 (which I'm also selling).

[wagtunes]

I do think it is interesting that we have people now complaining that a softsynth sounds too much like the hardware it emulates

It's the KVR way.

[T-CM11]

I do think it is interesting that we have people now complaining that a softsynth sounds too much like the hardware it emulates

Bah, it's not authentic enough for me! How about it virtually breaking down in 30 years? Then needing expensive virtual repair and virtual parts...
And where's the virtual dust and dirt?