I'm not convinced that this is a bug, but rather how it happens in the original arcade. You can hear the 'ding' that happens when the sound CPU has initialized correctly. The only problem is that the attract mode has already started it's cycle and only by inserting a credit or adjusting the sound volume (as you mentioned, F2 menu) will the audio be played.
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After reading this it makes sence what you say! Its the same with Killer Instinct 2 also! The ding happens on KI2 also! There is no issus with how it runs. Thanks for your help!
