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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Timing with cross-slot sequencing
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jamos



Joined: Jun 01, 2004
Posts: 470
Location: Eugene, Oregon, USA
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G2 patch files: 36

PostPosted: Mon Mar 27, 2006 11:17 am    Post subject: Timing with cross-slot sequencing
Subject description: .. a problem
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I'm doing some experiments with distributed sequencing: primarily, putting a drum sequencer in one slot, and then using another sequencer in another slot to mute the first sequencer, using MIDI signals.

Unfortunately timing is difficult; because my mute signals arrive late. That is, if a particular measure is supposed to be muted, the first beat of that measure will play, and the first beat of the next (unmuted) measure will not.

The patch I've attached will illustrate part of the problem. This patch (which must be loaded in slot D) is a simplified version of what I'm working with. Note that when you play this, the first beat of measures 4, 8, 12, 1nd 16 will sound, and sometimes the first beat of 5, 9, 13, and 1 will not sound. (In my more more complex patch, the first beat of 5, etc. never sounds.)

I can get around this by adding approximately 10 ms (!) of delay in the clock lines of the slave sequencer (see the delay module in the FX section), but that is not a great solution in my eyes.

Does anyone have any suggestions on ways to improve this?


RhythmTest.pch2
 Description:
A patch that illustrates timing prtoblems in MIDI muting

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 Filename:  RhythmTest.pch2
 Filesize:  2.26 KB
 Downloaded:  604 Time(s)

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dasz



Joined: Oct 16, 2004
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Location: vancouver, canada
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PostPosted: Mon Mar 27, 2006 12:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

jamos,

I am not hearing any glitches here. Is there another example that glitches?

The problem may be related to the calculation order. I usually put my trigger stuff at the top left corner of the patch to make sure they get calculated first.

/Dasz

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3phase



Joined: Jul 27, 2004
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PostPosted: Mon Mar 27, 2006 5:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

using the busses instead midi for such tasks was my solution. you can send 8 digital signals over one bus by using the AD and DA modules.
So 8 differnt triggers using one bus.
Controlers can be sended using multiplexing...
I am not sure if 4track multiplexing works yet..was still in development when i checked it the last time but it is a great solution for sequencer tasks.
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selvmarcus



Joined: Feb 08, 2006
Posts: 121
Location: Berlin, Germany
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PostPosted: Mon Mar 27, 2006 5:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

would be possible to do 16 (or even 24) logic signals over a bus, just
by level scaling and summing with two DA/ADs to shift the bits. if there is a need, i would patch it for you...
needs 4 level amps to shift the lower bits up... hm

could give you also 3 note values 0-127 plus 3 gate lines per bus
(or 12 with the mux).

3phase, would you try the latest version of the 4-channel mux with
your sequencer patch sometimes?

the issue you had should be solved.

all the best,

/marcus
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jamos



Joined: Jun 01, 2004
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Location: Eugene, Oregon, USA
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PostPosted: Mon Mar 27, 2006 8:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Dasz;

The example I posted is not perfect because some of the problems are intermittent; perhaps on your system none of it happens. Also, this won't sound like a glitch; in fact the extra note on beat 1 sounds quite musical, but it's not what's intended. The missing beat 1 is intermittent on my system.

I did try some rearrangement but with no effect. Besides, the problem is so severe (somewhere between 5 and 10 ms of lag) that I don't think that module latency would cause it.

The multiplexed bus sounds like what I need to look at, I'll give that a try.
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Afro88



Joined: Jun 20, 2004
Posts: 701
Location: Brisbane, Australia
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PostPosted: Tue Mar 28, 2006 12:53 am    Post subject: Reply with quote  Mark this post and the followings unread

jamos wrote:
The example I posted is not perfect because some of the problems are intermittent; perhaps on your system none of it happens. Also, this won't sound like a glitch; in fact the extra note on beat 1 sounds quite musical, but it's not what's intended. The missing beat 1 is intermittent on my system.


Beat 1 is intermittent on my G2 as well. I highly doubt that this patch would perform differently on other people's G2, unless Dasz has a beta OS1.5 he's not telling us about Wink

That timing is pretty crap, considering it's inside the system.... but it did give me an idea for another type of signal degredation. Not very useful, but I give you:


midi degrade.pch2
 Description:
Interslot midi signal degredation

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 Filename:  midi degrade.pch2
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3phase



Joined: Jul 27, 2004
Posts: 1152
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PostPosted: Tue Mar 28, 2006 2:38 am    Post subject: Reply with quote  Mark this post and the followings unread

selvmarcus wrote:
would be possible to do 16 (or even 24) logic signals over a bus, just
by level scaling and summing with two DA/ADs to shift the bits.
all the best,

/marcus


that sounds interesting. can you maybe do a building block with that?
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dasz



Joined: Oct 16, 2004
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Location: vancouver, canada
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PostPosted: Tue Mar 28, 2006 8:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, I see. I'll listen to it again. And no, I don't have v > 1.4.
/Dasz

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