That is correct. The Instant DAW CD does not have the Mac OS ROM file needed to boot on the Mini.
If you particularly wanted the Instant DAW on the Mini, you could install the Mini CD on a temporary partition, insert the DAW CD (not booting off of it) to use Apple Software Restore to put Instant DAW on the main partition, then copy the Mac OS ROM file (and a few others) to the DAW System Folder from the Mini System Folder. Then, the DAW partition would be bootable.
Maybe someone will whip up a CD so you don't have to do System Folder brain surgery to get Instant DAW on a Mini.
Well the Instant DAW would require too many CDs; the way I installed it on the Mini (assumes you have 2 macs) was...
1) Boot the Mini in target mode
2) Connect to a working OS 9 unit that has:
a) instant DAW files already downloaded on it
b) The famous Ross mini CD image mounted on desktop
3) Run instant DAW and pick the mini's hard drive (connected via "target mode" as an external HD) as the destination drive
4) remove the newly created "multi-processing folder" under the extensions on the mini
5) copy from the Ross image to the mini hd:
a) the ROM file
b) any ATI extensions (delete the current ATI extensions on the mini)
Now you can boot to mini, but remove the ASIO drivers (BEFORE you attempt to launch Cubase) on the mini under the Cubase/ASIO and install firewire ASIO or USB ASIO for a working interface under OS 9, the stock system sound ASIO drivers will lock up Cubase and they are unusable
Lastly, if you just have the mini only: (no other OS 9 unit)1) make 2 partitions
2) Install ROSS CD on Partition 2
3) Boot to partition 2 and follow the instructions above to create the instant DAW on the first partition