MATRIXSYNTH: Analogue Solutions EG01 Envelope

Thursday, August 18, 2011

Analogue Solutions EG01 Envelope

via Noisebug on eBay

"Analogue Solutions Modules are the same physical size and use the same power connectors as Doepfer a100 modules. They will mount in Doepfer eurorack cases and are 100% compatible when patching.

The red stripe on the power ribbon is red line down if used with Doepfer cases.

Included is a eurorack power ribbon and eurorack screws. Analogue Solutions screws available upon request.

Width 12HP

Manufacturer Description:
Envelope Generator with EMS-style repeats

Width 12HP

The EG produces a CV that varies over a period of time. It’s start is triggered by a Gate or Trigger signal.

The main use for an EG is to vary the volume of a sound, (when used to control a VCA), to reproduce the way natural instruments sound. E.g. a piano sound starting loud when the key is struck, then gradually dieing away. It can also be used to change the timbre of a sound over time, by controlling the cut-off frequency of a VCF.

The most common EGs are ADSR, AD and AR (Attack, Decay, Sustain, Release). The attack time adjusts the rate at which the envelope will rise to its peak value. This is initiated with a Gate signal. The Decay adjusts the rate the signal takes to fall to the Sustain level. The Sustain level adjusts the level that the EG signal will sustain from the end of the Decay time till the end of the Gate signal (i.e. when the key is release). The Release time adjusts the rate the signal takes to fall from its current level to zero, after the end of the Gate signal (when the key was released). If a short Trigger signal is used to initiate the EG, there will be no Decay or Sustain portion to the EG signal. The signal will rise to peak level (Attack), then immediately fall from peak to zero at the Release rate.
Special EMS-Style Repeat Function

The EG01 has an EMS-style repeat function which is easy to use and adds powerful modulation capabilities.

When the sustain level is set to zero the repeat function will be active. The envelope will repeat (re-trigger itself) so as soon as the envelope finishes its cycle, it starts all over gain. In this mode the EG becomes an LFO or Oscillator. The speed is set by the Attack and Decay time. (The Release control will have no effect). By setting very short times an audio signal will be present!

Whether the repeat is short giving high frequencies (audio signals) or slow (like an LFO), by varying the Attack or Decay times you are changing the wave shape of the output. Anything from Saw to Triangle to Reverse Saw wave forms can be created.

The unique way in which the EG01 repeat works is that it will only repeat as long as the Gate voltage is at the Trigger input (i.e. the key is held down/sustained). This is a great bonus compared to other repeating envelopes in that rather than repeating indefinitely, it will only repeat as long as you want it to (by controlling the length of the Gate signal). One application of this is by setting the repeat function to create an audio signal. The output will only produce audio when a Gate signal is present. This gives you a gated audio signal - effectively an Oscillator through a VCA.

Controls & Sockets:
EG has A, D, S, R and Level
(push pull switch to select - to +)

EG also has and EMS-style Repeat function (when sustain set to zero and key held down) - this is an easy to use and powerful feature.
EG has Trig In, + Out, - to + (variable) Out."

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