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Hiram Becker Music Synthesis Epsilon II Analysis Index I. II. III. IV. V. VI. VII. VIII. IX. Front Panel Layout Voice Mode Pitch Bend Voltage Controlled Oscillator Mixer Voltage Controlled Filter Envelope Pitch and Filter Voltage Controlled Amplifier FX Prologue: The Epsilon II is a multi-oscillator, additive/subtractive synthesizer with built-in FX generators. I. Front Panel Layout Initially, there are two panels in the ensemble. The Epsilon Core and the Master. The Master, when clicked on, is simply the master volume and tune control. Click into the Epsilon synthesizer and begin dissecting the innards. II. Voice Mode The Voice Mode is one of a couple signal sources. Note Pitch and Gate live here for developing the signal source. The pitch can be affected by the PitchBend wheel, or the pb. It has a knob that controls the wheel’s effectiveness. There are also two switches in the Voice Mode that are identical, but one of them outputs to a Gate, and the second is further affected by wave oscillators and can be controlled by an on/off switch. III. Pitch Bend The Pitch Bend references it’s own Macro. Pitch Bend has a pb (I believe to be Pitch Bend) and two fb (probably frequency bends) controls that are routed into multipliers and additive Math Modules to rout them to the outputs 1, 2, and 3. These are subsequently routed from the Pitch Bend Macro to pb 1, 2 and 3 of the Voltage Controlled Oscillator. The PBend Macro is routed to the Voice Mode and the fb to the Voltage Controlled Filter. IV. Voltage Controlled Oscillator Within the VCO are three separate Oscillators. Each of these three oscillators has the ability to control the sawtooth, pulse and triangle waveforms. Its outputs flow to the Mixer and the levels of each oscillator can all be adjust there. V. Mixer The outputs of the VCO flow into the Mixer and the Mixer can adjust the levels of each of the three VCOs within its Macro. VI. Voltage Controlled Filter The Voltage Controlled Filter has a panel list to filter between two filters. The same variables affect either Filter. Both filters can play simultaneously in a number of ways – either down the center channel, or in stereo. It directly affects the fader in the VCOs’ tracks. There are a number of filters that the user chooses from in the drop-down panel. A cutoff knob affects all the filters. VII. Envelope Pitch and Filter The Envelope Pitch and Filter Macro has two Macros in it – one for each of the effects. Each of these has a Pitch and Gain terminal, connected to the appropriate input, and these affect the envelopes within each of the two Macros. The Macros are essentially identical. The Gain is dictated by the Velocity of the keystroke, and the Pitch is, well, controlled by the keystroke. VIII. Voltage Controlled Amplifier The VCA is the master amplifier knob. Its inputs originate from the Voltage Controlled Filter, and outputs to both the master amp knob panel and the FX control. IX. FX Inside the FX Macro are three FX variables for fun usage. Each of the FX can be turned on with a button in the FX panel, using one, two or all of them in unison. Given its position in the flow chart, it reminds me of an Aux bus.