You are right. Moving the unit to another Mac SoftRAID was able to handle the unit. (This was also a move from High Sierra to Mojave)

Unfortunatly it does not seem that SoftRAID is able to make valid RAID volumes on this device. Using four Samsung 970 PRO 1TB devices. Using Disk U...

Here is my experience: MacPro4,1 (early 2009) Two Apricorn Velocity Duo x2 PCI cards, in 16X slots Four Intel S3500 800GB SATA SSDs, two on each PC...