Playing around with the Synthi-E's envelope shaper.
It's an unusual beast.
We are all used to a 4 stage ADSR style of envelope.
EMS however used the Trapezoidal Envelope.
This also has 4 stages. They are Attack, ON, Decay, Off.
The Synthi AKS uses knobs to adjust the 4 stages, and can be set to
"manual" or "free run" triggering.
The Synthi E is much simplier.
Attack (rise) & decay (fall) are set using the rise & fall sliders.
On /off are determined by the gate length.
The 3 variants of the envelope are available simultaneously.
Variation 1 : attack & decay are adjustable using the sliders.
Variation 2 : attack is variable, but decay is fixed (fast)
Variation 3 : attack is fixed (fast) and decal is variable.
Connecting a gate to the second black input form the bottom (bipolar "?") will make it behave as if it were an LFO.
The envelope starts on both the rise & fall of the gate ... I think this is the equivalent "free run mode".
The gate itself is interesting ... it's a short to ground.
Touching a cable with your bare fingers will produce the required gate.
This is essentially an S-trig.
Manufacturers like (vintage) Korg & Moog use S-trigs.
About the patch:
I'm using a square wave to trigger the EG.... which is opening /closing the VCA.
The filter is in self oscillation mode.
If you still want to trigger the Synthi' gate with eurorack, you will probably need a V-trig to S-trig converter. I haven't tested this myself. These synthi's are rare and expensive so be careful if you plan to try this.
BTW, I don't recommend plugging anything into your synthi which is not from EMS.
The Synthi E's envelopes seem to have a 1.7Vpp range.
Analogue Systems still produce a Eurorack version of the Trapezoidal Generator.
(Thanks to James from Synthwerks for the info) .
"AS make both it (RS-510e) and the EMS filter module (RS-500e) both
now with universal mounting hole and power connector for both AS and
Doepfer systems".
now with universal mounting hole and power connector for both AS and
Doepfer systems".
..Erica Synths also has a Euro format envelope generator module... It looks like
two EMS Synthi functionality inspired looping envelope generators with
simultaneous unipolar (0V - 10V) and bipolar (-5V - +5V), VCA, Noise
generator and Sample & Hold. ...... That's nice :-)
I wonder if it's inspired by the Synthi 100, who's envelope shapers also have dual trapezoidal outputs.
The Synthi 100's envelopes however differ in that they have 5 triggering modes (Signal threshold, Hold, Single Shot, Free run & Gated free run) & the 4 stages are Delay, Attack, On, Decay.
The addition of a second output for each of the synthi 100's trapezoidal generators is pretty neat.
The second output lags behind the first by one quarter of a complete trapezoidal cycle.
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