Musically Inverted Doom tunes

Last October I saw MIDIFlipper on the forums by Shadow Hog so I used that and produced this

Let me know what you folks think.

Some tracks sound completely different and original.

Is it me, or not all instruments are inverted?

reminds me of this thing i made out of an inverted E1M2 tune.

C30N9: The "high" and "low" notes are inverted on the instruments that I know of.