Janne should've played that chorus lead in Hellhounds one octave higher like he does live, the higher pitch makes it sound sorta more dramatic. But it's quite vicious as it is. You could listen to all these keyboard pieces a lot longer, but these are fast paced COB tracks after all so they come and go, forcing to listen all over again.
Seriously when you compare the keyboard intros of Tie My Rope demo & album versions, you get an idea how Peter totally pawns Janne in terms of creating sounds.
You could also compare the intros to One Day You Will Cry and Japanese Hospitality, aka Tägtgren vs Janne.
I'm waiting for Janne to confirm this, but as long as he does I remain confident he didn't form those Blooddrunk sounds by himself. If he did however then I'm amazed.
He's a "piano shredder" after all, not a sound visionist. Or maybe it's just what COB / Alexi wants. I'm not saying it was Janne's idea to kill off much of the keys in AYDY and some choruses in HCDR / T,L&S.