Monday, 12 January 2015

Synton Fenix 1 - VCOs, EGs & VCAs

I though I'd upload some pics & a brief description of the VCOs, envelope
generators & VCAs of the Synton Fenix 1.

First the oscillators:

There are three VCOs. The first is the most complex with no fewer than 7 CV ins.
CV 1 is fixed to 1v/oct. We also have a CV2, PWM , sync source  & sync level input.
There is also a CV in for FM, and a CV to control the phase of the sub-oscillators.
The sub oscillators are both square an octave & 2 octs down..... great for some deep bass.

 There are 5 audio outs. - sine, square, ramp (reverse) and I've mentioned the square subs already.
The bottom dial is a phase shifter. - allows you to un-sync the phase of the sub-oscillators for added vibrato or to thicken up the sounds if mixed with other waveforms.

VCOs 2 & 3 are simplier. They have square and sawtooth waveforms with individual outs & four CV inputs

The VCAs are pretty standard:
Each have an audio  & CV input, and one out.

 The envelope generators are very different to your standard fare. EG 1 is described as a APDSR.

What's the P stand for?
P = Peak Hold.... this is a time control where the envelope is held between the attack and decay phases. (In EG2 the Peak Time is only active if the decay-release switch is set to the decay position)
In EG1 & EG2 the top pot sets the length of Peak Time.

From what I can decipher, EG1 can actually be used as TWO separate envelopes:
Top: A(P)DR.
Bottom:  a simple AD

EG 2 is like nothing I have seen before.
Firstly it has three outputs & there is no sustain control.
It has a switch which allows you to select between a APD envelope or APR envelope. We have pots for the attack time and peak hold time, plus a knob and a CV input for the Decay/Release time.

So it looks like the EG2 can be broken up into 3 separate envelopes:
EG2(a) = 1 which is the APR or APD (depends on the switch setting)
EG2(b) = 1 + 2 {a combination of EG2(a) + EG2(c)}
EG2(c) = 2 which is a APD envelope.

Goodness gracious me !!! :-)

EG3 is also very unusual.
Again, there are 3 outputs.
The upper one is your envelope.
The lower two are outs for gates (positive & Neg).

The envelope itself  has only decay & delay settings.
It behaves like a simple AD envelope with a sharp attack (immediate)

The Delay knob is a time delay. It delays the start of the envelope.
The delay will also delay the gate outputs relative to the gate inputs.

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