DS Volume draws the chart's volume as a low strip along the bottom of the price panel, behind the candles, with no panel of its own. Every completed 1-minute bar is filed by its exchange trading day and its minute of the day in the instrument's own time zone, and each chart bar's window is compared with the same clock window on the previous 20 qualifying sessions, so it reads minute, second, tick, range, volume, Renko and Heiken Ashi charts alike. The typical volume is the median and the spread the median absolute deviation, both on a log scale, so one FOMC day or one half-day holiday cannot move either; sessions that traded far less than the rest are left out automatically, and the history is requested in the background merged across contract rolls. A running tempo (a 30-minute half-life, reset every session) measures how far today has run above or below its baseline.

A bar 2 robust standard deviations below or above the clock baseline is QUIET or HEAVY; a SPIKE stands 3.5 or more above it once the tempo is taken out (the Iglewicz–Hoaglin outlier rule, not a tuned setting), is decided when its bar closes, and spikes within 15 minutes of each other are one burst, labelled and alerted once. A typical-volume line, a live-pace cap on the developing bar, a now / tempo / session caption and hover details sit on the strip, and five values are published for the Strategy Builder and the Market Analyzer. Day, week, month and year charts are read against the previous 20 bars. Every bar is compared only with sessions before its own, so history reads exactly as it did live: it does not repaint. It reads participation, not direction. Free for everyone.