It is because IB feed was NOT made as tick-by-tick and under no circumstances meant to build time&sales series, but instead exclusively to update TWS Screen grid. You should ask your brokerage/serious-time data seller if they provide DDE website link. The DDE plugin now available for AmiBroker allows to https://elliotthfeay.bloggerchest.com/28821949/data-for-amibroker-fundamentals-explained