It has been a journey to make it work with mac os9.
First attempted with an
Edirol UM-1, but it didn't work with any of the drivers that worked to me before. I even tested the Japanese files. At the end, it has broken. Tests on Mac OS X confirmed that.
Then I bought a Jamport thinking on serial MIDI.
Then looked for a cheap serial midi and found no affordable option.
I was not going to try USB+roland and looked for M-Audio and was afraid modern ones would not be OS 9 compatible.
Then look for a MIDIMAN interface, just to be sure.
Finally, a MIDISPORT 2x2 did the trick.
Really happy with the CS-10 implementation on Metric Halo Channel strip + TC + Lexicon + Digidesign.

But the Waves implementation makes it less clear on most plugs but the Rennaisanse compressor. You want to close the plug or all parameters keep as "marked" and it is a mess.