Old 07-27-2019, 12:13 AM   #1
PaulRich78
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Default LFO Frequency automation of volume

Ive done so many searches looking for an answer to this but just cannot find anything

Im looking for a way to automate the volume with an LFO frequency that that changes over time from say 12hz to 15hz as an example
Is there a way to do this in Reaper ?
Thanks in advance
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Old 07-27-2019, 05:52 AM   #2
domzy
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It won't give you exact frequencies in Hz, but a similar effect could be achieved with an automation item using the frequency skew option
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Old 07-27-2019, 05:54 AM   #3
PaulRich78
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I need to be able to get exact frequencies
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Old 07-27-2019, 07:23 AM   #4
domzy
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it's all just maths, so you could work it out as automation items give you the number of cycles.
It would be cool if you could modulate or automate Parameter Modulation parameters though. There's probably a feature request for it.
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Old 07-27-2019, 07:25 AM   #5
PaulRich78
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How would you work it out as maths ?

Yeah as of automation of modulation there been a request since 2011 I believe 🤣🤣
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Old 07-27-2019, 07:37 AM   #6
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I worked out a way to do it with two tracks and a MIDI LFO (second video) but that seems fiddly and completely unnecessary work when a tremolo effect is an LFO that you can automate volume with to precise Hz like this:




This seems silly in comparison to the above:

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Old 07-27-2019, 07:40 AM   #7
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Hz is cycles per second, automation items give you the number of cycles per item, so couldn't you just do a calculation based on the length of the item? I'm not sure how the frequency skew would work though, maybe have an automation item of your desired freq to start with, and another auto item with your desired freq to end and then maybe adjust the skew (of the first item) by ear.
Admittedly this is probably a hassle, but just throwing out there, someone else probably has a better solution

Edit - Karbo to the rescue

Last edited by domzy; 07-27-2019 at 07:42 AM. Reason: someone does have a better solution
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Old 07-27-2019, 07:44 AM   #8
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Quote:
Originally Posted by karbomusic View Post
I worked out a way to do it with two tracks and a MIDI LFO (second video) but that seems fiddly and completely unnecessary work when a tremolo effect is an LFO that you can automate volume with to precise Hz like this:




This seems silly in comparison to the above:

Thanks Karbo
I was doing a very basic version of this with the JS tremolo
But I’ll download the one you’re showing for a bit more editability
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Old 07-27-2019, 07:46 AM   #9
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Quote:
Originally Posted by domzy View Post
Hz is cycles per second, automation items give you the number of cycles per item, so couldn't you just do a calculation based on the length of the item? I'm not sure how the frequency skew would work though, maybe have an automation item of your desired freq to start with, and another auto item with your desired freq to end and then maybe adjust the skew (of the first item) by ear.
Admittedly this is probably a hassle, but just throwing out there, someone else probably has a better solution

Edit - Karbo to the rescue
Thanks for this but a bit complicated
I messaged someone this morning about making something specific for me in JSFX, so waiting to hear back
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Old 07-27-2019, 07:47 AM   #10
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I don't know if the Melda one is free, I just grabbed it because it was the first one I saw. Didn't have a chance to try the JS tremolo but I think at the end of the day, tremolo may be the easiest choice if it has enough control over the LFO shape and other params. A quick test showed JS:tremolo working pretty good to me.

A side note that you can right-click an env point and choose Set point value for precise frequencies - maybe obvious, just mentioning.
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Old 07-27-2019, 07:48 AM   #11
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Karbo I’ll take a look
The volume was just the starting place really
Then was gonna move to panning and see what other fx parameters made sense musically
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Old 07-27-2019, 11:43 AM   #12
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I like the free Pecheneg tremolo and automate that either speed in Hz or host beat (via bpm+note), depth of effect and you also have control over the waveform, phase of it and symmetry. Interestingly you can also switch to be a panner as well (just saying, since you mentioned pan!).

The automation is in Hz (up to 32Hz)

For a freebee, quite nice.

dB
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Old 07-29-2019, 11:47 PM   #13
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Quote:
Originally Posted by Dr Bob View Post
I like the free Pecheneg tremolo and automate that either speed in Hz or host beat (via bpm+note), depth of effect and you also have control over the waveform, phase of it and symmetry. Interestingly you can also switch to be a panner as well (just saying, since you mentioned pan!).

The automation is in Hz (up to 32Hz)

For a freebee, quite nice.

dB
Amazing Dr Bob
Thanks
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