Since BASS 2.4.17, the iOS versions of BASS/add-ons are dynamic libraries rather than static libraries, the same as on the other platforms. I'm not familiar with "rad studio delphi", but this change should generally just require linking with the new *.xcframework files instead of the old *.a files. If XCFrameworks aren't supported then you can try linking with the frameworks inside them (note there's one for devices and one for simulators).