Quote Originally Posted by Lord Contaminous
Oh yeah.

Abadox (the game rips off some parallax of Life Force/Salamander)

S.C.A.T.

And Natsume's pause sound is one tone off of being accurate of the Konami pause sound.
I think that might be a clue that whoever was doing the sound at Konami either started working for Natsume as well or left Konami altogether. This kind of thing happens and you'd never realize it. For example, the same guy that wrote Time Pilot and Gyruss for Konami quit the company, and was then hired by Capcom only to come up with games such as 1942, Ghosts 'N' Goblins, Trojan, and I think even Commando (though I'm not sure.)