I noticed that too... a have a friend here that builds multi-cades and I was testing one out and, of course, had to try out Gyruss... ... so sad. Sounded like you were playing the game through 3 daisy-chained hearing aids, all set on low.
I love the game so much I have a board here just waiting for a cabinet. I don't go out of my way to stock up on stuff I don't plan on using... but I got the board, built an adapter, and repaired the thing with NO cabinet to even put it in... yet. I just know that the game is on my list of stuff I want, and now it's just playing the waiting game to get a decent cabinet. ... in the meantime, it stays plugged into my JAMMA machine just for the attract mode sounds.