Hello Miro,
A user contributed Sound repository would be pretty cool if that's what you're thinking. To be able to share and categorize sound files would be excellent. It also might inspire others to create and/or contribute data to help the Roland W30 community grow.
Personally, I think the two main issues of the Roland W30 are it's boot/storage method and having adequate software to load samples. You seem to have the software covered with SMFW30. This is great. On the hardware side of things, I'm still hunting around for a good solution to the floppy boot system....that's another topic I know.
Once I can use the SMFW30 effectively to get WAV files into the W30 more easily, I am interested in creating videos and sample files to help improve the Roland W30 community. The W30 still has much potential that has been limited due to it's previous software and hardware storage limitations.
The next release of your SMFW30 will truly be groundbreaking I think. A Sound Repository would definitely enhance the product and experience for sure.
Thanks Miro!!
Jim