I think i'll be lucky to get an answer to this cuz i really can't explain the sound that i wanna know how to make...anyways, the only time I've heard it is in Children of Bodom songs, so i guess someone familiar with their music could help. Off the top of my head, Hellion and Wrath Within are the songs that use it in the solo. Its only a few notes at about 2:11 into Wrath Within which is toward the end of the solo. If i can think of a way to explain the sound, ill post again.