Good morning from Norway
You will need to download the mix from the pinsound community page, and then transfer it to a usb stick. Preferably a fast type 3 usb stick. Now, it is important to unzip the mix folder before transferring to usb stick. this way you can play almost instantly without having to wait for the board to unzip ( like 30 minutes or so..)
So, the board reads from the usb stick and nothing is really loaded into board memory.
You can also download the original sounds to the same usb stick, and easily switch between them by turning the volume all the way down. I do this sometimes, when in retro mode
PS: I see you also have a Frankenstein in your collection. I have made a mix for that too, check it out