History: What are common parameters for each copy of a delay?

What are common parameters for each copy of a delay?

• Number of copies, tempo sync, gain, duration, filtering, amplitude.
  Amplitude and gain are very similar.
• None of the other answers.
  There's a decent answer.
• Tempo sync, gain, duration, filtering.
  Missing one...
• Number of copies, tempo sync, gain, duration, filtering.
  Great work!