A moving average with a fixed percentage band above and below.
Simple and predictable: the band is always the same % away, unlike Bollinger (deviation) or Keltner (ATR).
Useful when you want 'x% above its average' as a rule without volatility changing the distance.
Worked out by the same code the builder uses, on stored daily candles. Move a setting and the line moves with it. This is what happened, not what will happen.
Entry: Price close is above Envelopes(20, 2.5) upper.
A fixed % is too wide in calm markets and too narrow in wild ones.
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