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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Two obvious bugs, what's up with them?
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greaseenvelope



Joined: Aug 10, 2005
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PostPosted: Wed Sep 21, 2005 11:32 am    Post subject: Two obvious bugs, what's up with them? Reply with quote  Mark this post and the followings unread

Hi guys, I'm a two month user of a new G2X, and I've been reading the forum for a while. Now have some questions of my own.

The first is one that has been mentioned here before: the low quality of the delay line. This is particularly bothersome to me because I had planned on using the g2 as a primary fx unit and replacement for an on stage mixer for vocals in one of my projects. The main problem is that when you sweep the delay time while external imput is being fed it results in harsh digital aliasing. All I wanted is the effect you get from sweeping the delay time on say, a boss dd5 or ps2 on your mixer fx loop, something which should easily be implimented in the G2X. I've used the excellent BBD and RevoxA77 emulations and frankensteined them for my own purposes, both of which work around the problem somewhat, but still can't figure out why such an obvious bug hasn't been addressed. I would definately like to see this addressed if not in a software than in a hardware upgrade.

The second is something I discovered today: that copying and pasting modules changes the parameters on them almost randomly. After a few weeks of figuring out Robs elegant spectrum tilters and ladder filters and screamers, now I have to reset all the parameters by hand if I want to add them to patches I've already made?? What kind of inanity is this?? It's adding 3x the time to my work flow in making new patches. This seems like a really simple problem and I don't know why you guys haven't raised a storm about it on here already (if you have I haven't seen it).

Otherwise I have to say, I've enjoyed the intelligent level of discussion on this forum and the intelligent design of the machine itself, it sees like every time I get around a new corner in understanding my perception of its power and flexability increases.

Last edited by greaseenvelope on Wed Sep 21, 2005 1:40 pm; edited 1 time in total
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cebec



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PostPosted: Wed Sep 21, 2005 11:44 am    Post subject: Re: Two obvious bugs, what's up with them? Reply with quote  Mark this post and the followings unread

Quote:

The second is something I discovered today: that copying and pasting modules changes the parameters on them almost randomly. After a few weeks of figuring out Robs elegant spectrum tilters and ladder filters and screamers, now I have to reset all the parameters by hand if I want to add them to patches I've already made?? What kind of inanity is this?? It's adding 3x the time to my work flow in making new patches. This seems like a really simple problem and I don't know why you guys haven't raised a storm about it on here already (if you have I haven't seen it).


I haven't experienced this at all. Believe me, if I did, I would've raised a storm, indeed. You're using 1.32?
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Kassen
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PostPosted: Wed Sep 21, 2005 11:50 am    Post subject: Re: Two obvious bugs, what's up with them? Reply with quote  Mark this post and the followings unread

greaseenvelope wrote:
Hi guys, I'm a two month user of a new G2X, and I've been reading the forum for a while. Now have some questions of my own.

The first is one that has been mentioned here before: the low quality of the delay line. This is particularly bothersome to me because I had planned on using the g2 as a primary fx unit and replacement for an on stage mixer for vocals in one of my projects. The main problem is that when you sweep the delay time while external imput is being fed it results in harsh digital aliasing. All I wanted is the effect you get from sweeping the delay time on say, a boss dd5 or ps2 on your mixer fx loop, something which should easily be implimented in the G2X. I've used the excellent BBD and RevoxA77 emulations and frankensteined them for my own purposes, both of which work around the problem somewhat, but still can't figure out why such an obvious bug hasn't been addressed. I would definately like to see this addressed if not in a software than in a hardware upgrade.


Wait, wait, wait. The delay modulation problem is entirely seperate from the delay bit-depth case. Variable delays with smooth modulation are non-trivial to cook up. There are multiple alternative strategies possible for doing this and all have their own effects on what the result sounds like.

If it realy were a easy problem then the bug would not have been in there.

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blue hell
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PostPosted: Wed Sep 21, 2005 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Welcome greaseenvelope to electro-music.com.

This first point you mention is indeed troublesome, but not too much for short delay time settings (100 ms range or smaller) - I think those ranges to be usable.

Regarrding the 2nd point - I did not notice this either. When you copy / paste all the variations (that can have different settings) are copied as well - are you sure you are looking at the same variation in both the copy / source and past / destination patch ?

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greaseenvelope



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PostPosted: Wed Sep 21, 2005 12:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

RE: The copy/paste problem. That did it Blue Hell!!! Thanks for the heads-up, I'm actually working with your BBD design to make a voice processing patch right now.
I think I understand what you guys are talking about with the delay issue. I guess I will just have to keep studying and experimenting to see what works for me. As I said before great forum, thanks for the advice everyone.
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blue hell
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PostPosted: Wed Sep 21, 2005 1:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Glad the copy/paste thingy got solved.

For the delays, when you want to modulate long delays you could split up the delay in a long one and a short one, where you modulate the short one only. To see how that would work out.

BBD, hey I could use that as well :-)

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also .. could someone please turn down the thermostat a bit.
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Tim Kleinert



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PostPosted: Wed Sep 21, 2005 4:03 pm    Post subject: Re: Two obvious bugs, what's up with them? Reply with quote  Mark this post and the followings unread

greaseenvelope wrote:
The main problem is that when you sweep the delay time while external imput is being fed it results in harsh digital aliasing.


Take heart. This isn't a problem of the delay lines.

The problem is that the control knobs are not smoothed. So it's actually the discreet "127 step MIDI CC#" nature of the controls that creates the aliasing when manuallly sweeping delay times.

Easy fix: use a constant value module patched into a glide module to smooth out the "127 values" steppyness -presto!

Patch attached.

best,
tim


SmoothDelayTweak.pch2
 Description:
simple demonstration of smooth delay time tweaking

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 Filename:  SmoothDelayTweak.pch2
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Rob



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PostPosted: Thu Sep 22, 2005 12:23 pm    Post subject: Re: Two obvious bugs, what's up with them? Reply with quote  Mark this post and the followings unread

greaseenvelope wrote:
<snip>The main problem is that when you sweep the delay time while external imput is being fed it results in harsh digital aliasing.<snip>


It is not really a bug, the control input of the delayline is just 'too fast'. What happens is that when a fast varying cv signal is fed to the delay time modulation input the readout point in the delay memory starts skipping samples, which is quite normal. The faster the cv signal varies, the more samples are skipped. A slowly varying cv does hardly skip values. So, like Tim said, all you need to do is insert a Smooth module just before the delay modulation input and set it to 2 sec to 8 sec.

Yes, that is a very long smooth time indeed. But if you think about it it is logical. Imagine that you would want to sweep though one second of sound (a block of 96000 samples) in only one millisecond (the timespan of 96 samples at 96kHz sample rate), this would mean that each following 96kHz sample period the pointer would jump over one thousand samples! But if you sweep through one second of sound in one second one already warps the pitch up to an extremely high pitch or an extremely low pitch. So, to force a smooth glide of 2 seconds for a delay modulation over a span of 500 msec of audio is extreme enough for the ear.
What some other manufacturers do is indeed smooth the control of the delay time modulation. Which on the G2 one simply patches oneself.

You might have a look at the Revox A77 patch at http://electro-music.com/forum/topic-7442.html. You can see how I smooth a 500 msec delayline with 2 secs smooth (and a 2 sec delayline with 8 sec.)
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greaseenvelope



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PostPosted: Thu Sep 22, 2005 4:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks again guys. That was was a really simple way of explaining it and the bottom of that patch made it right into my toolbox folder. As regards your Revox a77 patch Rob, it sounds great but I find myself wanting to vary the whole delay time at once on the fly, meaning I could maybe add some of the glide function as in this delay patch to those values and be good to go.

I am the narrator/singer/synth jockey in an absurdist space rock evangelical freakout called "Space Hawk" and i'm looking to make a few different kinds of vintage psychedelic sounding reverb and delay patches for my voice and synth bubbles. Also Skinny Puppy-like distortion and bit crunching filters for my voice as well for those "special moments". I am discovering the need for several kinds of imput level controls on the fly to compensate for or avoid feedback depending on the delay levels. I'm experimenting with noise gates, compressors, and so forth but have yet to find the magic formula of where to put levels without the gate "pop" getting too bad. That my band is really loud/noisy doesn't help matters much.
I also need to be able to control relative volume of patches within a performance as I've found the above problems reduce considerable when constant relationship between main volume and mic imput is found, and haven't really found a good way of doing that yet. Btw, am I in danger of blowing this preamp by singing into it like a punk rock Jim Jones/Bob Calvert? I very much want to avoid the hassel of bringing a personal mixer and slew of effects etc but if i'm going to destroy my g2 doing so I may wish to reconsider.

Studying that Matrix synth spread over a whole performance posted in another thread is really helping me grasp the way the global parameter pages work. It's my goal by tour next month to have a set of performances with all the synths I need integrated so I can just be in performance mode the whole show with morph groups set etc. I need to integrate bussing options as well so that depending on the size of the venue I can provide them an additional clean out of my voice through bus routings etc, basically thinking of each of my performances as a mixer with internal aux routing etc.

Any suggestions?
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Kassen
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PostPosted: Thu Sep 22, 2005 4:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

greaseenvelope wrote:
...........Also Skinny Puppy-like distortion.......

........Any suggestions?


Dave Oglivy is a master engineer, I heard quite a bit of his work and I'm convinced the trick is in multiple paralel tracks of everything (all mangled in diferent ways). The later in his work the more tracks. All of those get different treatments, then probably limited and compressed together. You might want to use very short static delays on some to get rid of the G2's sample acurate timing. It might be interesting to use a 16 (or Cool bit reduction with a 12 or so KHz bitrate, then a effect, then another bit crucher, both with slightly mismatched lp filters on some of those paralel "tracks" to simulate his use of relatively old/cheap gear here and there.

This is one case where it might be advisable to use all 4 outputs of the G2 and mix them analogue. You could also considder diferent pan settings for stereo effect and simply layering takes that are as identical as possible; NIN's The Downward Spiral (also Rave's work) uses quite a bit of that.

It's not all just distortion, if you just use one kind of distortion you risk sounding like a 16 year old breakcore producer from Belgium.

Take a dub kind of additude to mixing, meaning that everything non-esential frequency wise in every track needs to be hacked out or you'll be left with a blur in the end.

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greaseenvelope



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PostPosted: Wed Sep 28, 2005 1:44 am    Post subject: Reply with quote  Mark this post and the followings unread

No, I have no idea 3/4th of what people here are talking about, particularly as concerns Logic modules and signal dividing, but I hope to learn. I was just saying that because I came here from a similar forum where the LEVEL OF DISCUSSION I would consider to be less intellent. Wink
I am actually learning a fair deal about sound design from studying these forum archives, as opposed to just digging through old flamewars about analog vs digital to find someones review of an old delay rackmount.
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rnp



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PostPosted: Wed Sep 28, 2005 1:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I completely agree with greaseenvelope about the quality of discussion on here. it forces someone like me into spectatormode now and then but there's a lot to learn around here and I'm glad for that.
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Leo G2



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PostPosted: Wed Sep 28, 2005 1:54 am    Post subject: Reply with quote  Mark this post and the followings unread

greaseenvelope wrote:
No, I have no idea 3/4th of what people here are talking about, particularly as concerns Logic modules and signal dividing, but I hope to learn. I was just saying that because I came here from a similar forum where the LEVEL OF DISCUSSION I would consider to be less intellent. Wink
I am actually learning a fair deal about sound design from studying these forum archives, as opposed to just digging through old flamewars about analog vs digital to find someones review of an old delay rackmount.


i was only kidding, sorry.
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PostPosted: Wed Sep 28, 2005 8:04 am    Post subject: Reply with quote  Mark this post and the followings unread

rnp wrote:
I completely agree with greaseenvelope about the quality of discussion on here. it forces someone like me into spectatormode now and then but there's a lot to learn around here and I'm glad for that.

Looking at the logs of the forum, it appears that most of the people who read the forum are not registered members. The ratio is about 3 or 4 to one. Many are reading the forum via RSS feeds too.

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