The latest information on the price of additional effect content (Model Pass*) that can be loaded onto the PX-1 is available on this page: https://www.boss.info/global/products/px-1/model_pass/
*A “Model Pass” is a ticket you can purchase in the BOSS EFFECT LOADER app. After purchasing, the effects can be loaded into the additional area of the PX-1 through the app. If you want to load the same effect onto multiple PX-1 units, you need to purchase as many Passes as the number of units.