It was an english dub. Your right on the soundtrack, it was pretty off putting. I will probably give it another watch, I enjoyed it but I just didn't get it.
Have a nice little list of giallo to watch:
Case of The Bloody Iris
Hitch-hike
Black Belly
Don't Torture A Duckling
The Fifth Cord
All The Colours Of The Dark
EDIT ALSO
Killer Reserved 9 Seats
Eyeball
You'll Die At Midnight