Pressing Select button exits Smaart System Wizards. Pressing and holding a Select button while any of the Smaart System Wizards are running will exit the wizard and return you to the main VSL screen. Because of this, it is highly recommended that you do not make changes to the mixer hardware during analysis as doing so will interrupt the process.
http://support.presonus.com/entries/21490230-Holding-Select-Button-during-Smaart-System-Wizards-exits-Wizards-TS-Issue