Was heading over to see if there were updates for mbsid and found this post.
http://midibox.org/forums/index.php?/to acwindows/
In the last weeks I re-implemented the MIDIbox SID sound engines in C, so that
it is possible to run MBSID on a STM32 core, but also to emulate it accurately on a Mac or PC.The AU/VST gives you the possibility to try some MBSID patches before building the hardware.
The sound isn't so fat like on the original, the filter sounds weak and there are a lot of aliasing
effects when higher frequencies are played... but probably you will like it anyhow.