KVR Audio

AnX · Post by **AnX** » Fri May 01, 2020 4:52 am

BONES wrote: Thu Apr 30, 2020 9:26 pm The filter is even worse than the Moog Ladder Filter when it comes to losing the bottom end at high resonance settings....

24db yes, but the 12db doesnt

Examigan · Post by **Examigan** » Fri May 01, 2020 10:11 am

Stringzy wrote: Thu Apr 30, 2020 8:07 pm OP-X Pro, which gets version 3 refreshment this year.

Is there a v3 rumour going around about OP-X Pro II? If so, I didn't hear about it.

Examigan · Post by **Examigan** » Fri May 01, 2020 10:28 am

e-crooner wrote: Thu Apr 30, 2020 9:21 pm
Stringzy wrote: Thu Apr 30, 2020 8:07 pm
free emulation discoDSP has taken over
OBXD is for kids. George has taken over nothing. he can't even handle the acid guy, who drops his acid feces on George whenever he desires.

big boys cool their ballsacks in a summer breeze and play OP-X Pro, which gets version 3 refreshment this year.

Rich's OB-Xa will be the new ballsack cooler.

carry on.
I just couldn't deal with the GUI of the OP-X Pro, frankly.

There is a Rack Edition that is easier to use.

BONES · Post by **BONES** » Fri May 01, 2020 11:47 am

AnX wrote: Fri May 01, 2020 4:52 am
BONES wrote: Thu Apr 30, 2020 9:26 pm The filter is even worse than the Moog Ladder Filter when it comes to losing the bottom end at high resonance settings....
24db yes, but the 12db doesnt

Yeah, that's true, I hadn't really noticed. But the 12dB filter is generally a lot more useful than the 24dB, which is quite unusual. The resonance on the 12dB filter is tamer but it is full of grit and character.

AnX · Post by **AnX** » Fri May 01, 2020 1:08 pm

I'm pretty sure they are diff filters

EvilDragon · Post by **EvilDragon** » Fri May 01, 2020 1:44 pm

They are indeed different. In OB-Xa, 24dB is a typical ladder design, and 12dB is state variable (like SEM), but LP only.

zerocrossing · Post by **zerocrossing** » Fri May 01, 2020 2:29 pm

When is this bad boy due out of beta?

AnX · Post by **AnX** » Fri May 01, 2020 2:31 pm

prob not long, I would guess a May release, but stuff like manuals, demos, vids etc prob still need doing, so.....

vitocorleone123 · Post by **vitocorleone123** » Fri May 01, 2020 6:14 pm

EvilDragon wrote: Fri May 01, 2020 1:44 pm They are indeed different. In OB-Xa, 24dB is a typical ladder design, and 12dB is state variable (like SEM), but LP only.

Thanks for that tidbit of info. That alone tells me it'll be a nice synth to pick up as something complimentary to my OB-6. Can't wait to use both in a song.

Ingonator · Post by **Ingonator** » Fri May 01, 2020 7:22 pm

EvilDragon wrote: Fri May 01, 2020 1:44 pm They are indeed different. In OB-Xa, 24dB is a typical ladder design, and 12dB is state variable (like SEM), but LP only.

I guess i alraedy mentioned that but in the OB-Xa the 12dB and 24dB LPF are actually 2 independent circuits using their own CEM 3320 filter chip which means the OB-Xa has 2 filter chips per voice.

Details about both OB-Xa filters and other CEM 3320 filter designs are found here:
https://electricdruid.net/cem3320-filter-designs/

Quotes from the part about the OB-Xa filters:

The 24dB/Oct lowpass filter is a fairly standard design, although it uses a +15V/-5V supply. Otherwise, it is much as the datasheet suggests. I don’t understand why they specified 1% resistors for the Frequency CV input, and then went and put a 10K trimmer in – seems daft to me. Perhaps the 1% resistors had better thermal characteristics or something.

The 12dB/Oct lowpass filter is a completely different story! This is nothing like the datasheet! Instead, Oberheim have used the chip to implement a 2 pole state-variable filter. Stage 1 is only used to mix the signals. This is usually done with a differential op-amp, but they’ve saved one amp by doing it like this. Stages 2 and 3 are the actual filter poles, and Stage 4 is unused. I think the fact that they haven’t got a proper differential amp accounts for the extra-complicated feedback and resonance paths, but I’m not sure. Given that this is a state-variable filter, it should also produce a highpass and a bandpass response, but these aren’t used here. It’s a pity, as that would have set the OB-Xa apart from the competition.

EvilDragon · Post by **EvilDragon** » Fri May 01, 2020 8:23 pm

Yes, you already mentioned that. More than once.

mi-os · Post by **mi-os** » Wed May 06, 2020 10:11 am

May i ask you to make all, not just most, parameters controllable via MIDI? Some parameters are missing in Legend iirc.

I'm looking for great sounding and fully controllable synth plugins for ages. I think there are only a few simpler ones that have it.

AnX · Post by **AnX** » Wed May 06, 2020 11:27 am

mi-os wrote: Wed May 06, 2020 10:11 am May i ask you to make all, not just most, parameters controllable via MIDI? Some parameters are missing in Legend iirc.

what is missing?

some stuff is intentionally left out as it is problematic (cpu spikes, loud noises etc) and users see it as a bug

mi-os · Post by **mi-os** » Wed May 06, 2020 12:41 pm

AnX wrote: Wed May 06, 2020 11:27 am
mi-os wrote: Wed May 06, 2020 10:11 am May i ask you to make all, not just most, parameters controllable via MIDI? Some parameters are missing in Legend iirc.

what is missing?

some stuff is intentionally left out as it is problematic (cpu spikes, loud noises etc) and users see it as a bug

Legend misses some stuff on the back panel like 'performance' (mod matrix) and the polyphony switch on the front panel for example.

The thing is when you want to build hardware controllers yourself you want everything and then decide what parameters you omit or want to have in your design. But i found there are often important parameters missing and for me that gets in the way to ever finish something.

Robmobius · Post by **Robmobius** » Wed May 06, 2020 12:59 pm

take my money...

Upcoming Synapse OB-Xa: Obsession