I did some testing, and I've confirmed that Attract Mode does NOT work with ASIO4ALL and GroovyMAME ASIO in Windows 10.
ASIO4ALL says that AM has control over the sound device, so it can't start.
This is a deal breaker, boys. I can't use Attract Mode anymore.
See this link for a demo of ASIO MAME. There's really no going back from this. You can't tolerate the shitty audio latency in standard MAME after experiencing this.
https://www.youtube.com/watch?v=_7tZeKxi2wEUPDATEDid some more testing, and so far, MALA and Big Blue are the only frontends that seem to work with ASIO. You have to give MALA some credit. For such ancient software, it's held up pretty well.