Hi there.
Hope the link helps below
http://www.ketron.it/prodotti/dettagli.asp?sezione=5&idProdotto=4

You can actually go to the latest software release and keep a previous releases sounds.
I think I used to have 4.0c in mine but the original SD1 sounds as I prefered them for some reason to the updated ones.
There's plenty of SD1 owners on SZ so someone will point you in the right direction. If you have the PC connection and software with the SD1 it's far easier to update and transfer things like new styles to the SD1's hard drive. It's quite cheap to buy and is a great time saver