Mod instructions here:
http://www.gti.net/wallin/audio/audio.html

Not quite the same mod as posted above?
(LF only)

C1, C2 from 1uF to 10uF
C3, C4 from 1uF to 47uF
C7 from 10uF to 220uF
C9 from 22uF to 220uF