The Vaccinator Compressor is a compressor kit based on the OTC-201 Compressor. It features an optical design with two knobs for sustain and volume. The volume knob, called Balance, allows for a range of 0 to 11 on the output of the compressed signal. When combined with the mode toggle (SW2), you can choose between 100% compressed or a clean blend. The clean blend layers the compressed signal at a fixed volume with the compressed signal on top.

The Vaccinator also has a 3-position switch for cutting or increasing the input gain, making it versatile for high or low output instruments. The optical compression ranges from smooth and unobtrusive to squishy, with a transparent tone that accentuates the treble at the beginning of each note and lowers the highs as the note decays. This results in a crisp and articulate sound that cuts through the mix without becoming too bright.

Additionally, there is an internal toggle to select between buffered or true bypass switching.

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