electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Sync problem with "standard" loop config
Post new topic   Reply to topic Moderators: Nord Modular Editors
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
jamos



Joined: Jun 01, 2004
Posts: 514
Location: Eugene, Oregon, USA
Audio files: 4
G2 patch files: 41

PostPosted: Mon Jan 03, 2005 9:21 pm    Post subject: Sync problem with "standard" loop config Reply with quote  Mark this post and the followings unread

I'm having a problem with chained (serial) sequences; I just figured out enough about it to ask for help.

In the attached patch, there's a sync problem if I stop the sequencer in the 4th measure and then restart. I get an extra beat in the first measure immediately after restarting. This does not happen if I stop in measures 1, 2, or 3.

I'm using the internal master clock for this. OS = 1.24

Does anyone else experience this? Is there a solution?

TIA


Basic Beat Box.pch2
 Description:

Download
 Filename:  Basic Beat Box.pch2
 Filesize:  7.36 KB
 Downloaded:  1512 Time(s)

Back to top
View user's profile Send private message Send e-mail Visit poster's website
varice



Joined: Dec 29, 2004
Posts: 961
Location: Northeastern shore of Toledo Bend
Audio files: 29
G2 patch files: 54

PostPosted: Mon Jan 03, 2005 10:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

I changed the 3 ClkDiv module modes from "Gated Mode" to "Toggled Mode" and that seemed to fix the problem. Not sure why the way you have it patched does not work.
_________________
varice
Back to top
View user's profile Send private message
jamos



Joined: Jun 01, 2004
Posts: 514
Location: Eugene, Oregon, USA
Audio files: 4
G2 patch files: 41

PostPosted: Mon Jan 03, 2005 10:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, that did indeed do the trick.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
varice



Joined: Dec 29, 2004
Posts: 961
Location: Northeastern shore of Toledo Bend
Audio files: 29
G2 patch files: 54

PostPosted: Wed Jan 05, 2005 1:15 am    Post subject: Reply with quote  Mark this post and the followings unread

jamos,

I traced the problem to an issue with the calculation order of the first and last sequencer modules. The last seq module needs to be calculated before the first. See page 122 of the G2 manual for more about the calculation order of modules. This serial sequence module scheme is actually a feedback loop which confuses the system into not being able to determine which module needs to be calculated first.

At first I thought that the problem with your patch had something to do with the fact that you had placed clock divider modules between the clock generator and seq modules, but I checked and found that the problem you descibe exists with a serial seq setup just like the example in the manual.

My testing shows that if the clock is stopped while the seq position is in the last module (with an exception explained below), when the clock is restarted, the first step of the first seq module will take 2 clock pulses before advancing to step 2 on the third clock pulse. Of course, the seq should advance to step 2 on the second clock pulse. Now the seq will be behind by one step. If you have an event trigger set on the first step (like your patch), the seq trigger output will send 2 triggers at step 1 before the seq advances to step 2 (that causes the double trigger of the drums in your patch at step 1).

The exception: If you happen to stop the clock at the very last step of the last seq module, the restart problem will not occur.

Solutions to the problem:

1. In the Editor, move the last seq module(s) either to the left of or above the first seq module to force the last seq module(s) to be calculated first. But this looks mighty damn ugly!

2. Add a Logic Delay module between the ClkGen clock pulse output and the seq modules clock inputs, set the delay to the shortest time (0.10ms). After a clock restart, this clock pulse delay allows the first seq module to read both the Reset and Loop inputs before the first clock pulse arrives. (See the online help about the seq modules common parameters for more info about these inputs).

I'm still not sure why changing the mode of the ClkDiv modules seemed to fix the problem in your patch. Maybe this mode takes an extra calculation cycle or two?

_________________
varice
Back to top
View user's profile Send private message
blue hell
Site Admin


Joined: Apr 03, 2004
Posts: 24079
Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320

PostPosted: Wed Jan 05, 2005 11:54 am    Post subject: Reply with quote  Mark this post and the followings unread

A related problem and some solutions can be found at http://electro-music.com/forum/post-28574.html

Jan.
Back to top
View user's profile Send private message Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic Moderators: Nord Modular Editors
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use