The only modded unit I know about belongs to RandyTsauch and maybe a search here could provide you with his comments. I believe it was Stan Warren who worked on his unit. Other modders that currently have or will have something for this unit are:
Ric Shultz www.tweakaudio.com - not sure about the details you should e-mail him
Dan Wright www.modright.com - completely changes the analog ouputs including the introduction of tubes. See the details at Dan's forum over at HD
Richard Kern www.audiomod.com - not sure about the details, you should e-mail him
Ed Meitner www.emmlabs.com - converts the 1000 to a transport that can hook into Ed'd proprietary 6 channel SACD DAC6 (DAC costs some $6K!)
This should get you started...
Ric Shultz www.tweakaudio.com - not sure about the details you should e-mail him
Dan Wright www.modright.com - completely changes the analog ouputs including the introduction of tubes. See the details at Dan's forum over at HD
Richard Kern www.audiomod.com - not sure about the details, you should e-mail him
Ed Meitner www.emmlabs.com - converts the 1000 to a transport that can hook into Ed'd proprietary 6 channel SACD DAC6 (DAC costs some $6K!)
This should get you started...