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Author Topic:   Start Phase of LFO
sidechain
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posted 24 February 2003 14:47         Edit/Delete Message   Reply w/Quote
I've been trying to make a sine wave LFO that lets me assign a fader to the start phase. I'm aware that in the oscillator prototype there is a reset parameter but that only resets the start phase to zero. What i'd like to do is have a toggle switch that starts the LFO and a fader that selects which part of the phase it will start from... how can i do this? Sorry for all the posts, but i basically just got my Kyma system!

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pete
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posted 25 February 2003 16:47         Edit/Delete Message   Reply w/Quote

PhaseLFO.kym

 
Here one way of doing it. But the phase will change when ever the slider is moved and not only when retriggered

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sidechain
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posted 26 February 2003 17:12         Edit/Delete Message   Reply w/Quote
Thanks a lot Pete! That's a really clever formula you came up with... it's very much appreciated!

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sidechain
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posted 13 March 2003 18:15         Edit/Delete Message   Reply w/Quote
I've been trying to modify the start phase LFO so it uses a triangle wave instead of a sine wave... i've tried to use the same principles used with the sine wave but i can't get it to work. How would i go about choosing the start phase of a triangle LFO? Thanks

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pete
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posted 15 March 2003 16:34         Edit/Delete Message   Reply w/Quote
Yes ,The method I used for the sine wave is for sine waves only. Its one of the things that make sine waves so special.

If you want to do it with other waveforms you can use a delay module (with zero feedback). If you put " 1 s " in the max time field, then the variable delay field value will represent seconds. You can then put " (1/!Freq)*!Phase " in the variable delay field. This is where !Freq is the same value as the frequency of the original waveform and !Phase would be 360 degs at value 1 (90 degs at value 0.25). In this case the lowest LFO freq would be one cycle per second.

If you needed lower frequencys you would have to put more seconds in the max delay field and adjust the formular in the same proportion.

Hope this helps

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bruno
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posted 16 March 2003 12:15         Edit/Delete Message   Reply w/Quote

phases.kym

 
may be, you have a look at this Sound, it might be another solution.

bruno

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pete
Member
posted 16 March 2003 13:52         Edit/Delete Message   Reply w/Quote

LFOPhaseTest.kym

 
Yes Bruno
Yours idea is far more efficiant than mine.
So attached is your method with a variable phase control.

Pete.

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