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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Tuning feedback delay line?
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redmar



Joined: Aug 06, 2012
Posts: 26
Location: Bologna, Italy
G2 patch files: 4

PostPosted: Fri Nov 21, 2014 8:02 am    Post subject:  Tuning feedback delay line?
Subject description: Not sure how to do this...
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So I was trying to imitate the tuned delay line that some dsi synth have..for now I'm just trying to make a delay line at the end of a synth architecture and not to feed the delayed signal back to the oscillators mix. I was hoping to obtain a kind of 'guitar + amp feedback' sound.
Following this tutorial by Rob Hordijk for nord modular g1
[ http://colourofsound.8088.org/nord/data/DelayModule.html ] (almost at the end of the page)
I came out with this patch that kinda works (except for it messes things up after c#7), but I needed to tune the patch by ear (probably because the difference in the delay module), and I feel that the effect is not constant across the keyboard..so I'm wondering if there's a proper way to do this, and if that is possible on the G2.
Thanks for any help..(and excuse me for my bad english)!


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Moody33



Joined: Apr 28, 2009
Posts: 111
Location: France
G2 patch files: 16

PostPosted: Fri Nov 21, 2014 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

There is a comb filter module which can track your keyboard notes. The comb filter is a delay line...
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Blue Hell
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Joined: Apr 03, 2004
Posts: 22587
Location: The Netherlands, Enschede
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G2 patch files: 319

PostPosted: Fri Nov 21, 2014 5:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

You have a couple of delays in series .. every next one will add one sample delay, making the delay longer relatively for short delay times. Or the pitch being flat a bit.

You can replace the six delays by one, set to a delay time >= 6 * 5 ms. which would be 100 ms, or set it to 25 ms, which may be enough too for your purpose .. experiment a bit, and uou will have to retune a bit for that, the result would probably be better.

You'd still have to tune by ear tho, but thats just once.

Oh and on the NM Classic it was not perfect either.

Edit : I added two spaces to your post to make the URL work.

Edit : the NM classic delay is 2.65 ms ... so 6 * 2.65 = 15.9 .. meaning 25 ms for the single delay will be fine.

Edit: in fact for the NM Classic it would matter in what order you'd add the modules to the patch ... for the G2 that does not matter, it still matters though where they are on the screen, evaluation is top to bottom. left to right.

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Blue Hell
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Joined: Apr 03, 2004
Posts: 22587
Location: The Netherlands, Enschede
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G2 patch files: 319

PostPosted: Fri Nov 21, 2014 5:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Moody33 wrote:
There is a comb filter module which can track your keyboard notes. The comb filter is a delay line...


Yes, that one could do the trick too, would need a couple of mods of course.

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redmar



Joined: Aug 06, 2012
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PostPosted: Sat Nov 22, 2014 6:04 am    Post subject: Reply with quote  Mark this post and the followings unread

@ Moody33: thanks, didn't think about it. It does track perfectly the kb, but I don't get the sound I'm looking for, and I don't have control over the feedback path (low/hipass filtering, etc..).

@ bluehell: thanks for your inputs, I wish I was more skilled in dsp signals..I'll try what you suggest.
PS: finally I know how to use [url]..
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Moody33



Joined: Apr 28, 2009
Posts: 111
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PostPosted: Sat Nov 22, 2014 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I don't have control over the feedback path (low/hipass filtering, etc..)


Just set the feedback knob of the comb filter to 0. Then you should be able to feedback anything you want into the comb filter. Just take care about overload. It should work. That's what Blue Hell was saying about "mods" I guess?
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redmar



Joined: Aug 06, 2012
Posts: 26
Location: Bologna, Italy
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PostPosted: Sat Nov 22, 2014 5:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok,now i get it. I'll try that too.
Thanks again!
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Tim Kleinert



Joined: Mar 12, 2004
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PostPosted: Sun Nov 23, 2014 3:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Other alternative is the string oscillator, which is a full-blown Karplus-Strong resonator with tuning-compensated HF damping.
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varice



Joined: Dec 29, 2004
Posts: 923
Location: Northeastern shore of Toledo Bend
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PostPosted: Sun Nov 23, 2014 5:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tim Kleinert wrote:
Other alternative is the string oscillator, which is a full-blown Karplus-Strong resonator with tuning-compensated HF damping.

A good suggestion. A fine example of using that module for tuned feedback is Ian's "ebaby" perf:

http://electro-music.com/forum/viewtopic.php?highlight=ebaby&t=9179

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redmar



Joined: Aug 06, 2012
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PostPosted: Mon Nov 24, 2014 3:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
A fine example of using that module for tuned feedback is Ian's "ebaby" perf


Fine indeed..I'm looking into it.
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redmar



Joined: Aug 06, 2012
Posts: 26
Location: Bologna, Italy
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PostPosted: Mon Nov 24, 2014 4:18 am    Post subject: Reply with quote  Mark this post and the followings unread

I start thinking that the osc string could be my best option, even if more dsp-hungry..there is clearly a lot of possibility.

Thanks everyone for clearing-up my mind!
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