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 Forum index » Instruments and Equipment » Modular Synthesis
envelope-start from 0V
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mr.extrem
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PostPosted: Sat Mar 15, 2008 3:32 pm    Post subject: envelope-start from 0V Reply with quote  Mark this post and the followings unread

Hi together
I have a question about triggering envelopes. It's a little bit difficult to explain in my good english, but let me try.
I want that my envelopes start allways from 0V, what is not the case when you have a high sustain level and a long release amount. Then my envelopes start allways from the level, where the release level ends.

So what i'm looking for is a way to reset the envellope, so that the attack phase allways beginn from 0V.

Here is a audioexample:

First with short attack and short release (In this case it's no problem because the release is short and has time to fall to 0V before the next note is played)
http://www.twango.com/media/mr-extrem.public/mr-extrem.10001

So and here is the problem. This time attack and release is long (The attack beginns not from 0V, because of the release is long)
http://www.twango.com/media/mr-extrem.public/mr-extrem.10002

I have a a-140 and a cw adsr-vc2 which both has a retrigger input. Does anybody know how to do this.

Thanks for each idea
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morbius



Joined: Feb 12, 2006
Posts: 95
Location: Great Smoky Mountains - USA

PostPosted: Sat Mar 15, 2008 10:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'd be looking at using a gate delay, or something that could alter the trigger/gate prior to the EG. On Synthesizers.com, I've had great results using the Q961... a module that actually designed to compliment the Q960 sequential controller... but when a keyboard gate is patched thru it's 'timed' (b) column, it has some... ummm... delay-like properties... kinda like a gate delay, but not exactly.

If you have a spare 2nd EG, try patching the two in series, and tweaking the first to affect the signal which the 2nd one sees.

Also- it never hurts to experiement, and think outside the box. While filters are generally thought of as being used for audio... you may try a low-pass, band-pass, or even high-pass filters, prior to the EG.... just to see what effect they/it has.

Good luck.

~Morbius~

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mr.extrem
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PostPosted: Sun Mar 16, 2008 12:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok, but i don't understand what a trigger delay can help for this problem. What do you mean can it help for..
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morbius



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Posts: 95
Location: Great Smoky Mountains - USA

PostPosted: Sun Mar 16, 2008 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, not precisely a trigger 'delay'... I was thinking of the effect I get on that Q961... it tends to alter the 'time' of the gate signal... there is some delay, and also, it affects how long the sustain of the gate is, but it has no 'release slope', as the release on an EG does.

From the description of the behavior of the EG, I'm thinking that altering the length of the gate signal may help. I don't know what the active threshold is for your EG's, but the dotcom EG threshold is 1.5 volts... so, it's either there, and the EG will fire, or it's not there, and the EG won't fire. But variables like EG sustain time, and actual length of the gate may cause the EG to behave, in conbination with the sustain setting, the way you want it to. Consider how varying the pulse-width of a sequencer's internal osc. afftects the EG. The percentage of the width has a great effect on how the EG responds and reacts.

I'm just suggesting some things to experiement with, regarding the EG issue/effect. "Happy accidents" don't occur without trying things you didn't think would work.

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mr.extrem
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PostPosted: Tue Mar 18, 2008 6:00 am    Post subject: Reply with quote  Mark this post and the followings unread

I think the time of the trigger and the gate should be as long as they are. I checked it what the retrigger function exactly does. Yes it starts the envelope new, but from this level where the decay ore release time ends and not from 0V.
And now, when you have a typical string envelope: long Attack and release, max. sustain level, then the envelope starts always from the max. sustain level and the attack falls out.

I don't know how this is made for example by the moog voyager, but on this synth it's the case that the envelopes are always reseted.
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Funky40



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PostPosted: Fri Mar 21, 2008 6:43 am    Post subject: Reply with quote  Mark this post and the followings unread

maybe you get the results you looking for with multiplexing 2 envelops.
that should work, but it is the question if sideeffects will occour.
i did multiplexing with envelops just once. I don't remember sideeffects
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davep



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PostPosted: Fri Mar 21, 2008 10:39 am    Post subject: Re: envelope-start from 0V Reply with quote  Mark this post and the followings unread

mr.extrem wrote:
Hi together
I have a question about triggering envelopes. It's a little bit difficult to explain in my good english, but let me try.
I want that my envelopes start allways from 0V, what is not the case when you have a high sustain level and a long release amount. Then my envelopes start allways from the level, where the release level ends.

So what i'm looking for is a way to reset the envellope, so that the attack phase allways beginn from 0V.

I have a a-140 and a cw adsr-vc2 which both has a retrigger input. Does anybody know how to do this.

Thanks for each idea


What you are looking for is how to RE-TRIGGER the envelopes. This means make them start again from the beginning at 0V, even if they are still in the middle of a previous envelope event.

And this is exacly what those retrigger input jacks are for on your A140 and ADSR VC2 modules. To use these, you need a short trigger pulse at the start of each new note, in addition to the gate signal that you connect to the gate input.

If your keyboard or midi-to-CV converter does not provide a separate trigger in addition to the gate signal, you can make one:

Connect the gate signal to a multiple. Send one output to the envelope gate inputs as always. Send the other output to some kind of module that produces a short pulse, like some kind of logic module. Or you can send the gate through a spare highpass filter, which will block the DC of the gate signal and produce a quick pulse that settles to 0V regardless of the length of the gate. (It may invert the signal so you may have to re-invert it again to get a positive pulse).

Once you have a quick trigger pulse that happens at the start of every keyboard gate signal, connect this signal to the retrigger input on the envelope generator. Viola!

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mr.extrem
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PostPosted: Sat Mar 22, 2008 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Funky40 wrote:
maybe you get the results you looking for with multiplexing 2 envelops.
that should work, but it is the question if sideeffects will occour.
i did multiplexing with envelops just once. I don't remember sideeffects


Hey funky...what do you mean with multiplexing? Do you mean to trigger an envelope with a other envelope?
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mr.extrem
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PostPosted: Sat Mar 22, 2008 3:34 pm    Post subject: Re: envelope-start from 0V Reply with quote  Mark this post and the followings unread

davep wrote:
mr.extrem wrote:
Hi together


What you are looking for is how to RE-TRIGGER the envelopes. This means make them start again from the beginning at 0V, even if they are still in the middle of a previous envelope event.

And this is exacly what those retrigger input jacks are for on your A140 and ADSR VC2 modules. To use these, you need a short trigger pulse at the start of each new note, in addition to the gate signal that you connect to the gate input.

If your keyboard or midi-to-CV converter does not provide a separate trigger in addition to the gate signal, you can make one:

Connect the gate signal to a multiple. Send one output to the envelope gate inputs as always. Send the other output to some kind of module that produces a short pulse, like some kind of logic module. Or you can send the gate through a spare highpass filter, which will block the DC of the gate signal and produce a quick pulse that settles to 0V regardless of the length of the gate. (It may invert the signal so you may have to re-invert it again to get a positive pulse).

Once you have a quick trigger pulse that happens at the start of every keyboard gate signal, connect this signal to the retrigger input on the envelope generator. Viola!


it's a good idea but unfortunatly the problem is something else. Also, if you retrigger a envelope, (a-140 ore the cwejmans) the envelope is not reseted to 0V. Retriggering the envelope makes only, that the envelope starts again with the attack phase, but it always starts with the level where the envelope at this moment is. So when at the time, where you retrigger the envelope, the envelope is for example on 4V, then the attack phase will also start on 4V and not on 0V.


So when you have the sustain wide open ore a long release, the attack falls away.
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davep



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PostPosted: Sat Mar 22, 2008 5:26 pm    Post subject: Re: envelope-start from 0V Reply with quote  Mark this post and the followings unread

mr.extrem wrote:


it's a good idea but unfortunatly the problem is something else. Also, if you retrigger a envelope, (a-140 ore the cwejmans) the envelope is not reseted to 0V. Retriggering the envelope makes only, that the envelope starts again with the attack phase, but it always starts with the level where the envelope at this moment is. So when at the time, where you retrigger the envelope, the envelope is for example on 4V, then the attack phase will also start on 4V and not on 0V.


So when you have the sustain wide open ore a long release, the attack falls away.


It turns out there is a discrepancy between the info about the A140 on the Doepfer web site and the info about it in the manual. The web site says the retrigger input will start the envelope "from scratch", meaning from the beginning, at 0V. However, the manual clearly shows that this is not the case. The retrigger input only starts the envelope from the level it is currently outputing, not 'from scratch' at 0V. Most manufacturers use the term 'retrigger' to mean starting the envelope from 0V but that is not the case with the Doepfer. it looks like it may not be possible with this module.

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mr.extrem
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PostPosted: Sat Mar 22, 2008 6:10 pm    Post subject: Re: envelope-start from 0V Reply with quote  Mark this post and the followings unread

davep wrote:
mr.extrem wrote:


it's a good idea but unfortunatly the problem is something else. Also, if you retrigger a envelope, (a-140 ore the cwejmans) the envelope is not reseted to 0V. Retriggering the envelope makes only, that the envelope starts again with the attack phase, but it always starts with the level where the envelope at this moment is. So when at the time, where you retrigger the envelope, the envelope is for example on 4V, then the attack phase will also start on 4V and not on 0V.


So when you have the sustain wide open ore a long release, the attack falls away.


It turns out there is a discrepancy between the info about the A140 on the Doepfer web site and the info about it in the manual. The web site says the retrigger input will start the envelope "from scratch", meaning from the beginning, at 0V. However, the manual clearly shows that this is not the case. The retrigger input only starts the envelope from the level it is currently outputing, not 'from scratch' at 0V. Most manufacturers use the term 'retrigger' to mean starting the envelope from 0V but that is not the case with the Doepfer. it looks like it may not be possible with this module.



Yes, i also think so...
But do you know envelopes, which are reseted to 0V?
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davep



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PostPosted: Sat Mar 22, 2008 6:37 pm    Post subject: Re: envelope-start from 0V Reply with quote  Mark this post and the followings unread

mr.extrem wrote:


Yes, i also think so...
But do you know envelopes, which are reseted to 0V?


Hmm. Well, I know the ADSR on the older Arp 2600 worked this way, and the Nord G2 can do this. But I assume you are looking for something in a eurorack module and I don't have much experience with those.

One thing to check - I know that there have been some ADSR modules in some vintage modulars that can act like the Doepfer ("retrigger" restarts it, but not from 0V) or they can also act like what you are looking for ("Retrigger" restarts it from 0V) and you can select the behavior from a jumper behind the panel. It may be worth checking to see if either of your modules has this 'hidden' function. You may have to check with the manufacturer.

BTW - I just remembered that my Encore Universal Event Generator module ALWAYS restarts from 0V when it gets a new gate and it doesn't even need a separate trigger signal to do this. But it's MOTM format and it's more elaborate & expensive than a regular ADSR.

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Funky40



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PostPosted: Wed Mar 26, 2008 6:00 am    Post subject: Reply with quote  Mark this post and the followings unread

mr.extrem wrote:
Funky40 wrote:
maybe you get the results you looking for with multiplexing 2 envelops.
that should work, but it is the question if sideeffects will occour.
i did multiplexing with envelops just once. I don't remember sideeffects


Hey funky...what do you mean with multiplexing? Do you mean to trigger an envelope with a other envelope?

No, i mean you can patch two envelops to a multiplexer, ahh they name it sequential switch.
in euroformat it would be A-151 ( not a-150 ), Blacet has also a sequential switch.


but shit, you have to mix the envelops..............no, i think my idea seems not to work as you like.
You can ask the defekt Gmbh boys if they know how to modifie it.
It might be very simple.........i'm not shure, but i think it is.

anyway: the A-151 is very useful for many things
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