How to achieve PWM on an MFO?
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- KVRAF
- 3139 posts since 28 Mar, 2008 from a Galaxy S7 far far away
I can see there are some parameters when creating an MFO, but I can't figure out how to perform PWM in realtime from the front panel of a Mux, is it even possible? Can someone help please, thank you
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- KVRAF
- 7411 posts since 8 Feb, 2003 from London, UK
Mmm, my usual approach would be knock something simple up: connect an LFO to the MFO wave index with a square wave source and a PWM transform with a four step block wave, then adjust the Wave Index and see what happens... Whilst adjusting the UI knob changes the displayed wave form, the LFO alone apparently has no effect... However, sticking an oscilloscope on the audio output and then changing the LFO frequency shows it's definitely having an effect.
(I've not listened to it... so I've absolutely no idea if the above is any use...)
(I've not listened to it... so I've absolutely no idea if the above is any use...)
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- KVRAF
- Topic Starter
- 3139 posts since 28 Mar, 2008 from a Galaxy S7 far far away
Thanks for the reply
Thing is, I was wondering if it could be done to an MFO that isn't specifically set up for it in the way you describe. Because that way means that that MFO is restricted to that usage only doesn't it?
Thing is, I was wondering if it could be done to an MFO that isn't specifically set up for it in the way you describe. Because that way means that that MFO is restricted to that usage only doesn't it?
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- KVRAF
- 1925 posts since 29 Mar, 2013
I think if you attach a Parameter Event Generator in between the LFO and MFO the UI will updateWhilst adjusting the UI knob changes the displayed wave form, the LFO alone apparently has no effect... However, sticking an oscilloscope on the audio output and then changing the LFO frequency shows it's definitely having an effect.
Beauty is only skin deep,
Ugliness, however, goes right the way through
Ugliness, however, goes right the way through
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- KVRAF
- 13852 posts since 24 Jun, 2008 from Europe
Attached is a quick example MUX with a Multi-Form Oscillator with 2 vector wave shapes, from pulse width 1% to pulse width 99%, that create a perfect PWM via the Wave Index.
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- KVRAF
- Topic Starter
- 3139 posts since 28 Mar, 2008 from a Galaxy S7 far far away
That's a great example, thanks. But I'm always a bit more demanding (awkward) than that! lol
I use the MFO as a quick wave selector. So I have set up 10 waveforms in the wave index. This allows quick front panel control without delving into the deeper aspects, or opening more windows.
I was hoping there may be a way to modulate the pulse width of the currently selected wave index? Like a dedicated modulation input for the MFO would be ideal, but obviously isn't there, so I am guessing, it can't be done, except the way you have done so.
I use the MFO as a quick wave selector. So I have set up 10 waveforms in the wave index. This allows quick front panel control without delving into the deeper aspects, or opening more windows.
I was hoping there may be a way to modulate the pulse width of the currently selected wave index? Like a dedicated modulation input for the MFO would be ideal, but obviously isn't there, so I am guessing, it can't be done, except the way you have done so.
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- KVRAF
- 1925 posts since 29 Mar, 2013
Can be done.....(kind of)
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Beauty is only skin deep,
Ugliness, however, goes right the way through
Ugliness, however, goes right the way through
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- KVRAF
- Topic Starter
- 3139 posts since 28 Mar, 2008 from a Galaxy S7 far far away
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- KVRAF
- 1925 posts since 29 Mar, 2013
It was a bit rough and ready and the more waves that you put in the more complicated it gets setting offsets so not sure how practical it will be in reality but the concept works I guess.
Beauty is only skin deep,
Ugliness, however, goes right the way through
Ugliness, however, goes right the way through
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- KVRist
- 106 posts since 23 Mar, 2014
i'm on an earlier version of MuLab, so am unable to load bibz1st preset. Apologies if the following is redundant.
You can pitch-modulate MFO to get mild PWM:
You can pitch-modulate MFO to get mild PWM:
- MUX preset in zip.
- Front Panel has a knob for MFO's Wave Index, a knob for PWM rate, and an oscilloscope.
- Unfortunately, it's not static and detunes MFO slightly.
- Crucially, the modulator oscillator has a balanced waveform (saw, square, triangle, sine), and plays the same note as MFO.
- The Audio To Modulation module is working at audio rate.
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- KVRAF
- Topic Starter
- 3139 posts since 28 Mar, 2008 from a Galaxy S7 far far away
Thank you for taking the time to make the preset,ill give it a try. No need to apologise for going to the trouble of helping out.