How Do You Add Envelope and LFO Signals Together in Modular Synthesis?

Combining Envelope Generators and LFOs with CV Mixers

Another powerful way to create sophisticated modulation signals is simply adding envelope and LFO outputs together.

The Basic Idea

Instead of one module controlling the other, both modules contribute to the final control voltage.

A CV mixer sums:

• Envelope output

• LFO output

The resulting combined signal is then sent to the modulation target.

Controlling the Balance

The mixer allows adjustment of how much influence each source has.

This means you can create:

• Mostly envelope-driven modulation

• Mostly LFO-driven modulation

• Equal contributions from both

The balance can be changed at any time.

One LFO or Two?

Many patches use:

• One LFO as the modulation source

• A second LFO as the envelope trigger

However, a clock divider can also allow a single LFO to perform both functions.

This often creates more tightly related modulation structures.

Interesting Targets

The mixed control voltage can modulate:

• Filter cutoff

• Reverb parameters

• Oscillator pitch

• Delay feedback

• Quantizer pitch ranges

Conclusion

Mixing envelope and LFO outputs creates modulation signals that combine cyclical movement with directed evolution.

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