A well known way to reduce noise in VCA is using the VCA’s in parallel. Here is my approach. A LM13700 used in parallel reduces the noise floor around 3dB.
Specs and features
• VCA with reduced noise floor
• Runs on +/-15V and +/-12V (with some resistors changed)
The documentation for download can be found in my website.
Nothing special here. Just two plain forward designed VCA with LM13700. With the signals added together.
Standard circuitry for Iabc and level control.