SCSI-2 CD-ROM drivers

["Joel" <joelbuckley54.nospam.@hotmail.com>]

I have Apple CD-150, CD-300 and CD-600 drives.
They all work for data reading, but only the CD-150 works for CD-Remote
audio play and the program controlled eject function.
I get the impression from reading the FAQs that I need a SCSI-2 driver to
support these functions.
It refers to one by Sequential Systems.
Their web site www.sequential.com doesn't seem to be up.
Is it available anywhere?
Does it work with Rev C and High Speed SCSI cards?
What exactly does it do that the standard driver doesn't?
TIA.

Joel