# ER-301/Sine Osc

## Applications

• Synth voice
• FM/PM synthesis
• LFO with sync capabilities
• Pass through a limiter to create a square wave.
• Waveshaper

## Parameters

### V/oct

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Pitch yes transpose (-3600¢ to 3600¢) logarithmic ratio

This parameter is used to transpose the base frequency up or down according to an incoming modulation value that is V/oct calibrated (typically one of the inputs from the ABCD matrix). In other words,

$\displaystyle \text{f} = \text{f0} * 2 ^{\frac{x}{1200}}$

where $\displaystyle x$ is the value of this parameter (which is in cents). For example, if the base frequency (f0) is equal to 55Hz and this V/oct parameter is set to 2400¢, then the resulting frequency will be 220Hz (i.e. 2400¢ = 2 octaves which is 4x).

### f0

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10,000 to 10,000) bias (10 octaves above and below 27.5Hz) frequency in Hertz

This parameter sets the fundamental frequency that is subsequently transposed by the V/oct parameter. Modulating this parameter corresponds to (thru-zero) linear FM.

### phase

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10 to 10) bias (-1 to 1) linear

Sets the phase offset of the oscillator. Modulating this parameter is equivalent to PM (phase modulation). You can even set the f0 parameter to zero and put the oscillator completely under manual control via this phase parameter. This last case is also called waveshaping.

### feedback

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10 to 10) bias (-1 to 1) linear

The feedback parameter determines how much of the unit's (pre-level) output should be used to self-modulate the phase offset. Increasing amounts of feedback causes the sine wave to morph into a saw-like or ramp-like waveform.

FYI: For low frequencies (<55Hz) and high feedback amounts (>0.95), the oscillator will turn chaotic briefly as it passes through zero.

### sync

 Control Type Has Sub-chain? Sub-chain Parameters Behavior Threshold yes threshold (-1 to 1) trigger

A trigger into this parameter will cause the oscillator to reset its phase accumulator to the value of the phase parameter. This is equivalent to the hard-sync on many oscillators.

 This sync operation is not anti-aliased. So audio-rate triggering of this parameter will exhibit strong anti-aliasing artifacts which depending on the desired result could be a good thing or a bad thing.

### level

 Control Type Has Sub-chain? Sub-chain Parameters Fader Scale Gain/Bias yes gain (-10 to 10) bias (-1 to 1) linear gain

This parameter controls an internal bipolar linear VCA on the output of the unit. It behaves exactly the same as the level parameter of a Linear Bipolar VCA unit.