Did a little digging in the archive. This is the full equivalence list (for searching and for sorting) that we finally came up in the Numark forum back in the time the D2 was released and how it was implemented.
• À, Á, Â, Ã, Ä, Å, à, á, â, ã, ä, å are treated as A • Ç and ç are treated as C • È, É, Ê, Ë, è, é, ê, ë are treated as E • Ì, Í, Î, Ï, ì, í, î, ï are treated as I • Ò, Ó, Ô, Õ, Ö, Ø, ò, ó, ô, õ, ö, ø are treated as O • Ù, Ú, Û, Ü, ù, ú, û, ü are treated as U • ß is treated as S • ¢ £ € ¤ ¥ are treated as $ • © is treated as (C) • « » are treated as " • µ is treated as u • · is treated as . • ¡ is treated as ! • ¿ is treated as ? • Æ æ are treated as AE • Œ œ are treated as OE • Ð ð are treated as DH • Þ þ are treated as TH • ß is treated as SS • × is treated as * • ÷ is treated as /