this ecm has various datastream messages. by default only the main engine data is logged. each additional message decreases the logging rate of the other messages being logged at the same time. press stream to enable a message. you also have a speed slider. that way you can make one message 'higher resolution' and one 'lower'. eehack is unique in that it has that sample rate control but also deals with alternating datastream messages in its log. your graphing and analysis tools are designed to deal with different sample rates and synchronizing them properly.