Do I need to update the firmware on my TimeLine, Mobius, or BigSky to use MultiSwitch?

In most cases yes. Please visit www.strymon.net/update for information on how to check your firmware version, and how to update your firmware. All TimeLine, Mobius, and BigSky pedals built as of February 17, 2015 ship with firmware that is compatible with MultiSwitch.  If your TimeLine, Mobius, or BigSky was built before this date then it will require a firmware update.