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Smoothed On-Balance Volume (OBV) — Volume Drop
On-Balance Volume is the oldest volume-trend tool there is, but a raw cumulative line is noisy and hard to read against price. This drop wraps Granville's classic OBV in an EMA signal line and an optional smoothing pass so you get a clean, color-coded trigger instead of a jagged tally.
## What it does
- Builds the cumulative Granville OBV: adds full bar volume on up-closes, subtracts it on down-closes, holds flat on unchanged closes
- Plots an EMA signal line (default 20) over the OBV for a tradeable cross trigger
- Color-codes the OBV line green/red by its position relative to the signal

