DJ Yoshitaka is also Yoshi-kun (よしくん). It is most obvious in the music comment for Day's.
Day's! [GuitarFreaksV3 & DrumManiaV3 OFFICIAL HOMEPAGE]
He has also been a part of Des-ROW for a while. There is a section on the Des-ROW beat revolution site called "Let's YOSHITAKA", but when you click on it, it says "COMING SOON"
Des-ROW Official Site