Raymond Russell on Nostr: The player routine has a pointer that lets it know where the module (tune) is located ...

The player routine has a pointer that lets it know where the module (tune) is located in RAM so you could locate several tunes in RAM and change the pointer. I went a slightly lazier route and kept the default pointer location and just copied the mods from there own memory location to the default location as required. I have plenty of RAM so it wasn't an issue.