Doepfer

Greetings and thanks to everybody for the feedback. 
I indeed referred to the Make Noise Maths panel control which gradually moves from log-->linear-->exp for a given AR envelope, cycled or not. As far as I can “listen”, I find that they are not very much the same, surely not in musical terms. Probably the specular/opposite, in the sense that the segments are bended in the opposite direction curves and upside down…one way for the first segment, the other way for the second, and this probably matches with the multiplication/division ratio mentioned above (?). 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. 


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? 


Best, Diego 






Il giorno 25/nov/2016, alle ore 14:46, "Florian Anwander fanwander@mnet-online.de [Doepfer_a100]" < Doepfer_a100@yahoogroups.com > ha scritto: 







Hello 

Am 25.11.2016 um 01:15 schrieb diegora@free.fr [Doepfer_a100]: 
> Do the A-14x EGs feature logarithmic, linear or exponential response curve of the segment voltage function? 
> I wonder especially for the A-143-1 
They are exponential (for log-vs-exp see Ville Oikarinens comment). 

It is quite difficult (but not impossible) to create linear envelopes 
with an analogue circuit, but it is dead simple to create an exponential 
envelope. 

Take as a basic princible: you have usually always a controlling source 
(example: Envelope or LFO) and a controlled destination (example: VCA, 
VCF). To get a linear increase of the recognized behaviour, always 
combine an exponential part with a linear part. Means: 

Use a linear VCA with analogue envelopes (because the envelope is 
exponential). 
Use an exponential VCA with an LFO (because the LFO is always linear). 

Florian