Bandlimited Sawtooth Oscillator

Generates an alias-free sawtooth wave at given input frequency.

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Bandlimited Square Oscillator

Generates an alias-free square wave at given input frequency.

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Bandlimited Variable Width Pulse Oscillator

Generates an alias-free pulse wave at given input frequency and pulse width (duty).

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Bandlimited Variable Slope Triangle Oscillator

Generates an alias-free variable slope triangle wave at given input frequency and slope. The slope changes the wave shape from sawtooth to triangle.

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Random Wave Generator

Everyone likes a little randomness...

Generates a random waveform of varying frequency and smoothness. The frequency determines how often the output changes. The smoothness, how quickly a transition occurs.

The output varies between ±1, with an even distribution.

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Mono Amplifier

A simple monophonic amplifier.

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4 Pole Low Pass Filter with Resonance

Emulates a low pass filter in popular analogue synthesisers. This particular filter is derived from one of many implementations of the Moog 4 pole filter.

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ADSR Envelope Generator

Generates an ADSR (Attack, Decay, Sustain and Release) envelope.

Driven by a gate signal - if the level of the signal goes higher than the Trigger Threshold), the attack stage begins, proceeds to the decay stage and then holds at the sustain level. The release stage begins when the gate falls below this theshold - even if the previous stages have not completed.

The output is a signal between 0.0 (rest) and 1.0 (peak) and the transitions are linear.

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ADSR Envelope Generator with Gate and Trigger

Generates an ADSR (Attack, Decay, Sustain and Release) envelope.

Does the same thing as the other ADSR (1658) above, except the Trigger Threshold is fixed at zero, and the additional Trigger input allows retriggering whilst the gate is still high.

The reasoning behind this design is to remove the need for a keyboard player to release a key before pressing another when using with a monosynth. The ‘Synth Secrets’ article in the November 1999 issue of ‘Sound on Sound’ explains this in detail.

The output is a signal between 0.0 (rest) and 1.0 (peak) and the transitions are linear.

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DAHDSR Envelope Generator with Gate and Trigger

Generates a DAHDSR (Delay, Attack, Hold, Decay, Sustain, Release) envelope.

Another envelope generator, this time with two additional stages - Delay, which delays the onset of the Attack stage, and Hold, which holds the output at maximum before the Decay stage begins.

Triggering works in subtly different ways to the ADSR (1680) - the Trigger will restart the envelope even if the Gate is closed - the effect of this is to proceed through the stages and begin the release stage immediately after the decay stage.

The final variant (ID 2038) uses control-rate gate and trigger, which is a little less CPU hungry, but will cause timing errors that are dependent on the block size being used by the host.

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Analogue Style Step Sequencer

Simulates an analogue step sequencer. The sequencer stores a number of values which are stepped through using a trigger when the gate is open, looping after a given number of steps.

There are three types, with 16, 32 or 64 maximum steps.

When the gate is closed, the sequencer returns to the start. Output when the gate is closed can be set to a default value. If not, it will just output the last value reached before the gate was closed.

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Quantiser

Quantises a signal to a set of arbitrary values within a range.

Match Range determines the distance from the quantised value that the input can deviate before being altered. This allows small variations in input to get through unmolested. If it is set to 0 the input is quantised to the nearest exact match.

Mode is one of Extend (0), Wrap (1) or Clip (2).

Steps is the number of quantisation steps to use (up to a maximum of 20, 50 or 100, depending on the variant in use).

For example, given the following settings:

• Range Minimum = 0.0
• Range Maximum = 12.0
• Match Range = 0.0
• Steps = 4
• Quantisation Values 3, 5, 7 and 10

and an input that is a line from -24 to 24, the output will be:

• Extend: -26, -21, -19, -17, -14, -9, -7, -5, -2, 3, 5, 7, 10, 15, 17, 19, 22
• Wrap: 10, 3, 5, 7, 10, 3, 5, 7, 10, 3, 5, 7, 10, 3, 5, 7, 10
• Clip: 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 7, 10, 10, 10, 10, 10

The quantisation values should all be within the range minimum and maximum for it to work!

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Clock Oscillator with Gate

Generates a non-bandlimited simple square waveform for use as a clock. Useful for triggering the sequencers, or anything else that uses a clock signal.

When the gate is closed, it outputs silence, and the phase is reset.

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Clock Pulse Oscillator with Gate

Same as the Clock Oscillator, but with pulse-width modulation.

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Frequency Modulator

Modulates an input frequency by a driving signal, transposing the frequency by ±1 Octave per unit amplitude of signal.

Note that the final variant (ID 1659) outputs Control data.

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Control to Audio Interpolator

Interpolates a control-rate (per-block) signal into a smooth audio (per-sample) signal.

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Signal Tracker

This tracks an incoming signal and outputs the result.

The rate controls tell the plugin how quickly to respond to a change in input. Low values will mean a slower response - a setting of 0 will hold the last value, and a very high value will track the input exactly.

Attack rate is how quickly an upward change is tracked, and Decay for downward changes. There are two pairs of these - the one used depends on the level of the Gate.

Example uses:

• An envelope tracker - use the ‘Gate Low’ track rates with the Gate held low, and run the output through a full-wave rectifier (an ABS() operator) to get an estimate of the level of a signal.
• Sample and Hold - run a narrow pulse wave into the gate, set the ‘Gate High’ rates to maximum, and the ‘Gate Low’ rates set to 0.
• Track and Hold - run a variable pulse wave into the gate, set the ‘Gate High’ rates to 0, and the ‘Gate Low’ rates set high. Varying the pulsewidth will vary the time the input is tracked, and when it is held.

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Signal Sum

Add two signals.

Note that the final variant (ID 1667) outputs Control data.

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Signal Difference

Subtract two signals.

Note that the final variant (ID 2033) outputs Control data.

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Signal Product

Multiply two signals.

Note that the final variant (ID 1670) outputs Control data.

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Signal Ratio

Get the ratio between two signals.

To avoid divisions by zero, 0 is treated as a really small number.

Note that the final variant (ID 2037) outputs Control data.

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Signal Branch

Splits an input signal into two identical signals. Somewhat redundant, as most modular synth hosts allow you to connect an output to more than one input. If your host of choice does not allow this, this plugin will do the job...

Note that the final variant (ID 1674) outputs Control data.

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