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 Forum index » Clavia Nord Modular » Bugs
DXRouter Module Bugs
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varice



Joined: Dec 29, 2004
Posts: 711
Location: Northeastern shore of Toledo Bend
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PostPosted: Sun Oct 20, 2013 12:33 am    Post subject: DXRouter Module Bugs Reply with quote  Mark this post and the followings unread

In the DXRouter module, Algorithm 28 has the 2 input incorrectly routed to both the Main output and the 1 output, when it should only be routed to the 1 output. Unfortunately, this means that any DX patch that uses this algorithm along with a signal from Operator 2 will not sound correct because the Operator 2 signal will be incorrectly routed to the Main output to be summed with the Operator 1 and 3 outputs when it should only be routed to modulate Operator 1.

There is also a minor problem with the Algorithm 13 graphic (select Variation 2 to show it in the Editor). This bug is probably just in the Editor software. I'm using the 1.40 version. It incorrectly shows two feedback loops, one for the Operator 2 connections and the other for Operator 6. The Operator 2 loop is incorrect. The module functions properly with the feedback loop implemented for Operator 6.

These bugs are present in both G2 OS 1.40 and 1.62 versions.


DXRouterBugs.pch2
 Description:
DXRouter Module Bugs demo patch

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 Filename:  DXRouterBugs.pch2
 Filesize:  2.41 KB
 Downloaded:  102 Time(s)


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Blue Hell
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Joined: Apr 03, 2004
Posts: 20272
Location: The Netherlands, Enschede
Audio files: 143
G2 patch files: 318

PostPosted: Sun Oct 20, 2013 7:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Shocked

Were they put in deliberately to see how much the G2 would be used as a DX7 emulator Laughing

That took quite some years to surface, amazing.

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varice



Joined: Dec 29, 2004
Posts: 711
Location: Northeastern shore of Toledo Bend
Audio files: 22
G2 patch files: 49

PostPosted: Sun Oct 20, 2013 12:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, I’m surprised that the Algorithm 28 bug was not noticed and reported before. I actually stumbled upon it while checking out some of the DX emulation factory presets. I was turning off and on the output of carrier operators to see how each “stack” in the algorithm contributed to the sound of the patch. On one patch/variation that uses 28, I turned off the output of Operator 1 to hear how the Operator 3 stack sounded alone. Then I turned off Operator 3 and was about to turn Operator 1 back on, but there was still sound coming out even though there shouldn’t be with both 1 and 3 turned off. I started turning off the other operators and quickly discovered that Operator 2 was producing the sound because of the bug in the DXRouter.

I decided to test theDXRouter module to confirm that the graphics and function matched the DX7 algorithms using the test patch that I posted. With a quick test I did not find any other obvious routing mistakes other than Algorithm 28. And only the graphic for Algorithm 13 appears to have an error.

One other thing that I noticed was that the output level of the feedback loop when set to the maximum value of 7 is significantly lower (about 9 dB) when compared to the output signal levels of Operators used for modulation. I don’t have a DX7 to do a comparison, so I can’t tell if this is an actual problem or not. There was a lot of testing done though while the DX to G2 patch convertor tool was being developed. I would guess that if this was a problem it would have been noticed back then.

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