Yep sound is still way off. I've done a lot of flights in and spent a lot of time around the Islander, I grew up on the isles of Scilly. It's really missing that buzzsaw of the 2 blade prop and the way the lack of prop sync gives it that magical harmonic so distinctive of a pair of lycomings just very slightly out of phase. It should be a fair bit more throaty at low RPM. The IO-540 is one of the best sounding motors in aviation. The default Baron is a lot closer to what the Islander should sound like in my opinion, although it doesn't have that buzzsaw at T/O power. Little more work needed!