Lemur : which expression to match volume faders ?

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madlab
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Lemur : which expression to match volume faders ?

Post by madlab » Wed Jul 11, 2012 2:42 pm

I'm trying to make a fader module in Lemur ipad that matches the values as dB in Live. For now, I've tried these formulas : 20*(log(x*127/108))*6/3.241 but it doesn't work. Could a math lover Live user or someone at Ableton give me the right formula ?
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3dot...
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Re: Lemur : which expression to match volume faders ?

Post by 3dot... » Wed Jul 11, 2012 3:00 pm

the volume faders are a touchy subject.. I've tried to figure out ..
even posted on the m4l forum..
the curve is still a mystery to me..

I'm new to Lemur.. but I think I saw somthing about it in the Liine/MutantTalk forums..
don't have time right now to look for it..
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madlab
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Re: Lemur : which expression to match volume faders ?

Post by madlab » Wed Jul 11, 2012 3:55 pm

This formula comes from the liine / lemur techniques forum... I think the Ableton programmers could share some infos about this.
Last edited by madlab on Wed Jul 11, 2012 7:03 pm, edited 1 time in total.
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3dot...
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Re: Lemur : which expression to match volume faders ?

Post by 3dot... » Wed Jul 11, 2012 4:52 pm

madlab wrote:This formula coes from the liine / lemur techniques forum... I think the Ableton programmers could share some infos about this.
yes..they could... but somehow they don't..
this kindof stuff should be in the m4l documentation..
a simple task like adding 4dB to the current volume via m4l is impossible otherwise..
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madlab
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Re: Lemur : which expression to match volume faders ?

Post by madlab » Fri Jul 13, 2012 10:45 am

3dot, is taht the topic you thought about ? http://liine.net/forum/viewtopic.php?f= ... 1698#p1698.
Maybe the array technique would be the closest if Abletonians don't want to share some lights about this (what I couldn't understand btw).
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3dot...
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Re: Lemur : which expression to match volume faders ?

Post by 3dot... » Fri Jul 13, 2012 10:52 am

yep ...that's the one..
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madlab
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Re: Lemur : which expression to match volume faders ?

Post by madlab » Sun Jul 15, 2012 9:04 am

Someone at Ableton please, on that really important matter...
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madlab
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Re: Lemur : which expression to match volume faders ?

Post by madlab » Tue Jul 17, 2012 10:55 am

I sent an email to the support team but didn't receive any answer till now. I have to say I would be really deceived not to be considered for this essential request.
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madlab
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Re: Lemur : which expression to match volume faders ?

Post by madlab » Mon Aug 24, 2015 5:06 pm

Still no official point of view ?
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brrt
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Re: Lemur : which expression to match volume faders ?

Post by brrt » Wed Dec 18, 2019 11:05 am

Old post, but still relevant because it wasn't answered yet.

Abletons fader curve is a tough nut to crack. I was able to get it exactly right from +6dB down to -18dB. From -18dB down to -70dB I have it almost perfect. Just sometimes there's a neglectible 0.1dB difference.
Anyway, please see my Max for live patch for more info. It contains my convertLiveFaderTodB and convertdBToLiveFader patchers. The formulas are in there. https://maxforlive.com/library/device.php?id=5886

chapelier fou
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Re: Lemur : which expression to match volume faders ?

Post by chapelier fou » Fri Dec 20, 2019 5:46 am

Wow, thank you !
MacBook Pro 13" Retina i7 2.8 GHz OS 10.13, L10.0.1, M4L.
iMac 27" Retina i5 3,2 GHz OS 10.11.3 L10.0.1 M4L.

chapelier fou
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Re: Lemur : which expression to match volume faders ?

Post by chapelier fou » Fri Dec 20, 2019 7:11 pm

Is there any chance that you would explain how the hell you came to these formulas ?
This is typically the kind of knowledge I wish I had.
MacBook Pro 13" Retina i7 2.8 GHz OS 10.13, L10.0.1, M4L.
iMac 27" Retina i5 3,2 GHz OS 10.11.3 L10.0.1 M4L.

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