SLI works well on my system, but, as we know, others on this forum are having nojoy with SLI. From what I've gathered from forum posts, ATI Crossfire is still pooched.
Re beta sounds: 109 sounds great on start up and in flight both external & in cockpit. Many also love the 109 flyby sound.
As your handle is "Hurricanedriver", I can only assume you're more interested in the Merlin engine sounds. My take is that the Merlin startup sound both external and in cockpit is very good. In flight engine sound is very good in-cockpit, poor external - although the Hurricane sounds marginally better externally than the Spitfire. Same applies for the flyby. The beta patch Merlin flyby is better than prepatch, but does not sound like a Merlin engine for either aircraft. Even Jafa's excellent sound mod was great for in cockpit and external inflight sound, but still retained the characteristic IL2 vacuum cleaner sound effect during flyby.
Guns: 109 cannon sound pretty good. Machine-guns on 109, Spits, and Hurries are very muted both in cockpit and externally.
The latest beta sounds are an improvement over pre-patch, but as noted above there is work remaining if accuracy in sound is the objective.
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