Translation of "Subtly" in Japanese

There are four types of sounds on the Japanese hand drum: Po, Pu, Ta, Chi. Po and Pu have very similar tones, but are subtly different.

鼓には、四種類の音があります：ポ、プ、タ、チ。ポとプの音色はよく似てるけど、微妙に違います。