Doepfer

hi everyone,

when i was answering joe's posts about the modular vocoder, i spoke 
of one of the missing functions from all the combined Doepfer LFO's. 
the variable waveform shape of the A146 LFO
does not have voltage control of the waveform. it's sad that the LFO 
doesn't have that function among other things. i think a combination 
of all the functions from the 3 LFO's a, plus VC of the Variable 
Waveform Shape and a Quadrature Sync Input with a pot to control the 
sync of another LFO.

i whipped up a mock up of what i call the A149 Voltage Control 
Variable Waveform LFO. please don't laugh my Photoshop skills, they 
are non-existant. i am posting the draft in the files section. 
remember this a first draft and i am sure with suggestions, the 
function layout could improve. 

since i am not an engineer and can't design the circuit myself, i 
don't know if the theoretical functions of the LFO are possible. but 
from all the time that i have experimented and played with different 
modulars, as well as reading block diagrams for different modules, i 
am led to believe that this LFO could be produced. at what price? i
would not know.

to get a crazy quadrature relationship from whatever amount of lfo's 
you wish to sync. you line up two or more lfo's together. you mult 
the Positive Pulse Out of the first LFO to the Reset Inputs of the 
following lfo's for clocking the other LFO's in the tempo. you could 
also use Clock Dividers for divide down relationships between several 
LFO's. then you take a mult of the regular Pulse Output and patch it 
to the Sync Inputs of the other LFO's you wish to have a quadrature 
relationship with( for a parallel relationship) or you could daisy 
chain them one after the other ( for a serial relationship). 

now here is the kicker, since there is a pot associated with each 
sync input, the pot becomes a variable modifier for the incoming sync 
signal. since its variable, you can really get wild sycopated outputs 
to drive multiple Sequencers, Envelop generators etc. you could also 
the take the last LFO's Positive Output and patch it back to the 
first LFO create some serious choatic quadrature outputs. now imagine 
having a few of these Lfo's to control a fully loaded Doepfer Modular 
Vocodoer, i am jonesing to have such functions with my modular.


i located the sync input above the Sine Output, so when you put 
another LFO next to it, it sits right next to the Positive Pulse 
Output. you could use really short cables to avoid patch cord 
clutter. you could also hard wire the LFO's together.

these ideas came to me after i drafted the mock up. it might be a 
good idea to have buffered double outputs for both of the Pulse 
Outputs to avoid the issue and head ache of multing. maybe a Voltage 
Control input for the Sync Input to have modulatable Sync for each 
LFO.

phew that was a lot for one sitting, i hope i didn't bore you with 
these ideas. these are the ideas and patterns i like to experiment 
with when it comes to modulars. that's i why i am always sad when i 
see functions that could have had voltage control attached to the 
module in the first place, but are not included. if there is enough 
interest, i will make a poll and see what happens. maybe Doepfer 
could take the lead and run with it, i sure hope this happens. thanks 
for your time and enjoy.

cheers,
RM

rm,
thanks for taking the time to share your idea!  i think your 149 
would be a brilliant module... would be nice to see a few doepfer 
offerings w this level of sophistication.   
duff