At least in TradeStation, the default setting for the volume indicator for 1-minute charts (and tick charts) is based on tick count - not trade volume. This setting can be changed. I mainly trade with a 1 minute chart. Since I discovered this setting, I keep two volume indicators - one for trade volume and one for tick count. In that way I can see when high volume is due to large block trades or not. What is your opinion on what to use and how?