well...from what I'VE learned:

1. 'n' is prounounced "nnn", basicaly the N without the 'e'. we all say n "enn" what this n is the sanem as how you pronounce n in "name" or "naik".

2. well.....coz they dont have the consonant L in their language, every l is somewhat pronounced "rr"...and true the other way round coz of the way our brain is . and the 'u' int he "roku" is sometimes silent, or bately heard. same as "tsu" and "su" so, roku can be pronounced "roku" or "rok-u" where the 'u' is silent. this 'u' is pronounced something like you say 'u' in "udang" or "udon" or "ular"

lol...i kind of hijacked the thread. sorry jhcj

aiyo...
even though they say it as "dess" ( with the silent u), you still have to spell it as desu liao