Wiardgroup

--- In wiardgroup@y..., liquidcolor@e... wrote:
> >     I received my Borg Filter about a week ago. Needless to 
say its
> >amazing! One thing puzzles me though.... How do I feed an
> >ADSR to it? None of the jacks are obviously labeled for this
> >function. Just for the record, I'm using MOTM 800 EG's.
> 
OK, I was not aware that the MOTM ADSRs had a 5 volt output. In 
that case, connect to both KEY FOLlow and MODulation inputs. 
This will allow the 5 volt envelope to sweep over the full range of 
the filter.

This is true for any set of inputs. The input summers form the 
agebraic sum of the inputs (in other words they add up positive 
and negative voltages). So the effect of connecting to more than 
one input is to multiply by the number of connected inputs.

i + i = 2 x i
i + i + i = 3 x i

As additional background, a synthesizer with +/- 15 volt power 
supplies has an internal voltage range of 30 volts minus the 
voltage limit of the op-amp outputs. In the case of TL074s, they 
limit at 13.5 volts. So the largest signal that can exist internally is 
27 volts peak to peak.

Now if the oscilators produce 10 volts peak to peak, summing 
two oscillators produces a 20 volt peak to peak signal, and 
summing 3 oscillators produces a 30 volt peak to peak signal, 
which can not exist internally. For this reason, the oscillators 
actually produce an 8 volt peak to peak signal, so three can be 
summed together to produce a 24 volt peak to peak signal, 
without clipping.

The VCAs on the oscillators have a gain of 1.25 so if an 8 volt 
peak to peak signal is run through them, it will be amplified to 10 
volts peak to peak.

The Wiard is designed to minimize distortion, unless you want it. 
If you route the sawtooth signal through the VCA set to 
maximum, and then route the signal to IN1, IN2 and IN3 on the 
Omni-Filter, it will be clipped and distorted. Or any waveform 
routed to all 4 inputs on the Omni-Filter will be clipped and 
distorted by the 4 x gain at the input.

i + i + i + i = 4 x i

Of course this applies to all modulars and not just the Wiard.