Sound Recording
Audio Recording
A record of sound is a sound recording of some kind. Might be minidisk, might be CD, might be digital. Whatever it is, it's still the record of sound.
ろくおん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
誰かがいびき録音用枕の特許を取得したというのは本当ですよ。
Someone actually got a patent for a snore recording pillow.