I think the newer version for Mac, 6.8.3, may have bank selections. I used it for a while on OS 10.4, but I ran into a lot of problems with it crashing.
There is a demo version you can try at:http://gvox.com/downloadsForm.php?reque ... m_demo.hqx
To run this particular version, these are the system requirements:
Macintosh: G3 CPU or better, 32MB of RAM, 16MB Hard Disk space, Mac OS 9.x or OSX 10.3 or higher.
I hope this helps.