Doepfer

Florian, thanks for focusing on the characteristics of Doepfer EGs attack slope… 


I see what you mean by psychoacoustics, though I did believe that those audible differences are real rather than consequences of individual perception. 


As for the velocity to modulate amplitude besides gated envelopes, do you mean that the velocity voltage and EG voltages should be mixed together and the sum sent to the unique VCA control input? If I am correctly following, I believed that this way they would mutually affect the result of each other. That's why I was thinking to rely on a 2 cv inputs VCA, one for the average amplitude (velocity) for each gate, the latter for more detailed amplitude “drawings”… Maybe it would be just the same result... 



Best, Diego 





Il giorno 25/nov/2016, alle ore 17:35, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] < Doepfer_a100@yahoogroups.com > ha scritto: 







Hi 

Am 25.11.2016 um 16:33 schrieb diegora@free.fr [Doepfer_a100]: 
> As for the A-143-1, the graphical marks show curved 
> segments for Attack (rises faster in the second portion) and Decay 
> (falls faster in the first portion). Especially the attack slope sounds 
> more expressive and naturally picking than the one performed on an 
> A-140. So I thought there must be a huge difference in the design 
> between the two EG. 
Nope. There isn't any difference in the characteristic of the 
attackphase. This is psychoacoustic: you hear what you want to hear. 
Electrically the type of the envelope circuit (loading / unloading a 
capacitor) is completely the same on both modules. 

> Another open matter to me is the possibility to take advantage of the 
> velocity out on the Doepfer MIDI interfaces. Many users adopt the gate 
> only to open the vca. I tried to fire velocity cv into the TipTop 
> EZ4000 Deviater input with non enthusiastic results. I wonder if 
> possible to have it to control a second cv input on a vca. It's not that 
> common. Maybe the new Doepfer quad vca might respond properly to both 
> gate and velocity, having 2 cv input jacks? Or would the exp character 
> of an EG soon saturate into an exp VCA? 
The correct patch of a velocity voltage for a velocity controlled 
signal-level is like this: 

You need one exp-VCA and one lin-VCA 

The VCO-signal is sent to the signal-in of the lin-VCA and the 
signal-out of the lin-VCA is the outputsignal 

The envelope (any Doepfer envelope) is sent to the signal-in of the 
exp-VCA, the signal-out of this exp-VCA is sent to the control-input of 
the lin-VCA which carries the audio signal. 

The velocity voltage from your interface is connected to the 
control-input of the exp-VCA which handles the level of the envelope. 

Florian