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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Why does this patch cut out?
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tombola



Joined: Mar 11, 2005
Posts: 83
Location: London
Audio files: 3
G2 patch files: 9

PostPosted: Sat Nov 12, 2005 4:35 pm    Post subject: Why does this patch cut out? Reply with quote  Mark this post and the followings unread

Hello, I was experimenting with the eight way delay line, trying to develop some extreme delay feedback effects like the GRM Tools comb filters.

I made this patch - just a simple synth going into a delay line with feedback.

I found that if the feedback is up high, and you energetically tweak the delay time, the audio cuts out completely for a second or two, only recovering when you've turned the feedback right down.

Is this a feature, or a bug, or some function of phase cancellation in the feedback?

It's a shame there's so much zipper noise on the delay lines when changing times, isn't it? Does anyone know if this is something that an OS upgrade could fix in future, or are we stuck with it?

Thanks!

ps: PLEASE WATCH YOUR EARS - GETS VERY LOUD


feedback test.pch2
 Description:
PLEASE WATCH YOUR EARS - GETS VERY LOUD
Nasty test of feedback in an 8-way delay line, which seems to cut out when levels get too hot. It's like a virtual fuse has blown...

Download
 Filename:  feedback test.pch2
 Filesize:  1.3 KB
 Downloaded:  659 Time(s)


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varice



Joined: Dec 29, 2004
Posts: 719
Location: Northeastern shore of Toledo Bend
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G2 patch files: 49

PostPosted: Sat Nov 12, 2005 6:35 pm    Post subject: Feedback Cutout Fix Reply with quote  Mark this post and the followings unread

The cutout of the sound is caused by a "DC" offset added each time the sound is looped and fedback. Just add a "DC" blocker (high pass filter) to solve the problem. This attached patch has the fix.


feedback_test_fix.pch2
 Description:
"DC" blocker added to prevent feedback cutout.

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 Filename:  feedback_test_fix.pch2
 Filesize:  1.36 KB
 Downloaded:  733 Time(s)


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cebec



Joined: Apr 19, 2004
Posts: 1064
Location: Virginia
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PostPosted: Sat Nov 12, 2005 8:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

see this thread for a discussion of the 'zipper noise' in the delay lines...

http://electro-music.com/forum/topic-7937.html

since the 8 tap doesn't have a mod input it's not feasible to apply the 'smoothness' tweak directly to that module, even via a MIDI control send/constant knob/glide combination, but i wonder if doing so with two Quad Delays and a constant knob/glide module will do the trick. sweep the constant value knob.

see the pic

*uh, what the hell? if you click on that pic (i have no idea where that came from) you'll see the one i actually uploaded of the patch i'm talking about... WEIRD!!

[moderator: yes, looks like a bug. So far, this is the first I've seen of it. It may be a fluke with moving the database over to a new server. Please don't change the picture until I've had a chance to analyze this. --mosc]



delay quad smooth.jpg
 Description:
delay quad x 2 smoothed?
 Filesize:  43.32 KB
 Viewed:  180 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

delay quad smooth.jpg


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Blue Hell
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Joined: Apr 03, 2004
Posts: 20480
Location: The Netherlands, Enschede
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PostPosted: Sat Nov 12, 2005 8:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey, thats the picture of Tom (v-un-v) that I uploaded for the test of the new server a few days ago- the thread we did that in no longer exists, but the picture survived seemingly ... otoh, Tom had posted that pic himself before, somewhere else, and that thread should still exist ... funny ...

I'll not try to fix it as mosc might want to have a look at this.

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