@ Cleezmo ---- Regarding your question, there is not the typical Active/Passive switch because the input stage offers a variable Gain/Volume control thus allowing you to run your gain lower / volume higher for hotter basses, and both controls more evenly for more passive basses. The Boost Switch does add another gain stage, which can offer you more overdriven tones --- BUT the Kinetix offers even more clean, dynamic performance when the Boost is engaged, but you continue to run the input stage towards the cleaner settings (Gain control lower, Volume control higher. Of course the Master Volume is there to increase your overall output once you have your gain settings where you like them.
Hope this helps.