History: What does an expander do?

What does an expander do?

• An expander increases the amplitude over a threshold.
  Yes!
• An expander targets a specific band of frequencies and reduces the amplitude on specific ranges.
  That is a de-esser.
• An expander is a collection of individual compressors for specific frequency ranges.
  That is a multipressor.
• An expander reduces the amplitude over a threshold.
  That is a compressor.