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 Forum index » Clavia Nord Modular » Nord Modular G2 Discussion
Why does this patch sound so weird?
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ark



Joined: Mar 06, 2008
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PostPosted: Fri Dec 05, 2008 6:12 pm    Post subject: Why does this patch sound so weird?
Subject description: I tried to create a simple FM patch and it doesn't do what I expected
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This should be a very simple patch: One sine wave frequency-modulates a second, which frequency-modulates a third.

What I find when I try it is that playing the same note several times in succession sounds different each time. Any idea what's going on?


Weird FM patch.pch2
 Description:

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 Filename:  Weird FM patch.pch2
 Filesize:  1.17 KB
 Downloaded:  682 Time(s)

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varice



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PostPosted: Fri Dec 05, 2008 6:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

It may sound different each time because you are triggering a new voice each time (16 voice count), and with each new voice, the phase relationship between the oscillators may be different. If you add a connection from the output of OscB1 to the sync inputs of the other two oscillators, this will force all of the oscillators to be in phase and should make each voice sound the same.

EDIT: Also, the waveform output from the second oscillator is not symmetrical about the zero level, which will cause the third oscillator to detune. If you use a Phase Modulation Osc for the third one instead, this detuning will not happen. From the online help about the OscPM:

"With this type of FM it is actually the phase of the waveform which is modulated, which means that the waveform is shifted forwards and backwards at a fast audio rate. The advantage of this method is that the modulation is not sensitive for what is named a DC component in the modulating signal. A DC component shifts the waveform upwards or downwards, making its long term average a positive or negative level. With true linear frequency modulation a DC component can detune the oscillator, which happens with the the oscillators with the FM Lin and FM Trk modes. But when the phase is modulated instead of the linear frequency parameter this detuning can never happen. This detuning is especially an issue when selfmodulation by feedback of the output to the modulation input is used. Selfmodulation works only reliable on this OscPM oscillator."

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Roland Kuit



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PostPosted: Sat Dec 06, 2008 2:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Varice explained this good. I had that years ago with making FM hihats and other FM stuff(NM). There was no PM Osc yet. The way to set them in phase was to sync them with a trigger pulse.
You can get this pulse from your keyboard(see attached pch).


weird_fm_patch_208B.pch2
 Description:
syncing FM phase

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 Filename:  weird_fm_patch_208B.pch2
 Filesize:  1.19 KB
 Downloaded:  637 Time(s)


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ark



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PostPosted: Sat Dec 06, 2008 8:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually, using an OscPM does just what I want without fuss.

(What I'm trying to do is see if I can make a patch that sounds somewhat like the Ableton Live "Operator" soft FM synth)
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