Logarithmic enveloppe

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Logarithmic enveloppe

Postby aerodrink » Sun Sep 28, 2008 4:20 pm

Hello

I'd like to set a log value (well ... 'inverted log' to be precise) to the AmpVol in the patchcord editor, because I really need a smooth long-lasting curve on that rhodes (+great attack) ... is there any tricky way to do this whith summing amps or something via patchchords ?? :roll:

I ask this because I never came to something really satisfying with the amp envelope :grumble:

Thanks

Olivier
Last edited by aerodrink on Sun Sep 28, 2008 8:15 pm, edited 1 time in total.
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Postby aerodrink » Sun Sep 28, 2008 8:14 pm

To be more precise, I'd need something like this :

Image
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Postby MFPhouse » Wed Oct 01, 2008 6:35 pm

under Midi Preference via Ctrl.#7
Master - Midi - Pref 1
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Postby aerodrink » Wed Oct 01, 2008 10:55 pm

Man, I suppose this only deals with the velocity response ... ?
What I need is a signal that begins when I play a note and that varies during the living of the note ...
Sorry if I'm not clear :mrgreen:
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Postby illinformed » Thu Oct 02, 2008 7:29 pm

I think you're almost there with the summing idea.

I'm sure a sharp attack on AmpEnvelope summed with a slowly oscillating sine wave LFO might produce some useful results. The LFO can be delayed as well so it doesn't have to kick in straight away. You might have to use the DC offset to move reduce the total result.

Just had another thought - LFO1 speed modulated by a triangle LFO2 thingy. The curve would start off steep then slowly elongate as the triangle tooth decreases. Would take alot of experimenting but the graph in my mind looks OK ;)

Apologies if this is tosh as I'm far from an Emu or manual at the moment and I'm on my 3rd glass of wine.

Andrew
Last edited by illinformed on Thu Oct 02, 2008 7:45 pm, edited 6 times in total.
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Postby MFPhouse » Thu Oct 02, 2008 7:35 pm

Try the " Lag Prozessor ", maybe there you get your Sound.

AttackTime - in LagIn 0 - / or / and - Amount in CC - and so on and so on

There is nothing in that machine, not with what you can do.
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Postby aerodrink » Thu Oct 02, 2008 9:52 pm

Guys this is quite exactly what I wanted to hear :thumbs:
Thanks for that great tracks ... I'll try different combinations (routed to pitch first, which in my opinion is the best way to realize what the curve "looks like") and post here if I come to something satisfying :slayer:

Thanks again !
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Postby plus321 » Tue Oct 28, 2008 6:31 pm

I realize that I'm late to the party, but you can accomplish this easy with recursive modulation.

Modding an attack that is linear with the same attack will make it exponential.
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Postby stu » Tue Oct 28, 2008 7:39 pm

plus321 wrote:I realize that I'm late to the party, but you can accomplish this easy with recursive modulation.

Modding an attack that is linear with the same attack will make it exponential.


That would work fine if the modulation was multiplied, but I'm pretty sure it is summed, so you just end up wih a linear attack that is twice as steep. I may be wrong tho if anyone wants to give it a go.
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Postby plus321 » Tue Oct 28, 2008 9:07 pm

stu wrote:That would work fine if the modulation was multiplied, but I'm pretty sure it is summed, so you just end up wih a linear attack that is twice as steep. I may be wrong tho if anyone wants to give it a go.


It works. Here is a small wav demonstrating the attacks.

First is linear, second is linear but twice the rate of the first, and the third is the rate of the first, but has its attack rate modded by its own envelope 100%

http://cs.1729.googlepages.com/e4kexpenv.wav (~100Kb)

You can look at the file in an editor and see the slopes, but you can hear it in this example.
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Postby aerodrink » Fri Oct 31, 2008 11:57 pm

Wow this looks like the perfect answer :thumbs:
Thanks a lot !
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