Sidplay 4.2 with ASID mod
Modified Sidplay 4.2 source code, available from: http://www.sidmusic.org/sidplay/mac/ http://www.twinbirds.com/sidplay/SIDPLAY4.zip
With Thorsten Klose's ASID mod http://www.ucapps.de/tmp/sidplay4-source_4_1_4_asid.zip http://midibox.org/forums/topic/13303-sidplayer-asid-application-for-os-x/?page=2
Unfortunately I am not enrolled in MacOS Developer Program, so I cannot distribute this as an application, but it should work when you just build it. You of course need to create/change signer id's, etc.