No. PX-1 additional effects are not subscription-based. They are available as one-time purchases.
The PX-1 comes with 16 effect models included, with eight pre-installed and ready to use right out of the box. Through the dedicated BOSS EFFECT LOADER app, you can also load the other eight into the additional area (up to eight models).
Starting in January 2026, more effects will be available as paid options, and you can add them to your PX-1 by purchasing a Model Pass*. https://www.boss.info/global/products/px-1/model_pass/
*What’s “Model Pass”?
A Model Pass is a license available for purchase in the BOSS EFFECT LOADER app. After purchase, the effect can be loaded into the PX-1 via Bluetooth® or USB-C® connection. Demo versions are also available, allowing you to try effects with a short audio gap every 30 seconds before deciding to buy.
Note: A free six-month Roland Cloud Ultimate membership is included with the PX-1. However, this is a separate service from what is provided by the BOSS EFFECT LOADER app.
BOSS PX-1 Plugout FX | Everything You Need to Know