Yep, is a Wytron DVD-319.
The problem I had was the controller was only recognising 2 drives not 3.
The DVD-319 has 2 IDE channels - one channel for two DVD writers (IDE 2) and the other for a DVDRom and 1 DVD writer (IDE 1). On the latter channel the DVDRom was being recognised but not the DVD Writer.
I was informed the DVD Writer was faulty and replaced this (at some expense) but it transpired it was not faulty at all. I eventually returned it and was informed the 319 controller was replaced so after a few months I got the thing back, repaired.
Incidentally, even though I can now write to the three drives only two drives are indicated in the LCD display so either this was an oversight in the bios or still a problem with the controller.
I contacted Wytron about the problems experienced but, to date, have not even received the curtousy of a response.