I was able to get a copy of the Solero executable (8.0.29.370) by using my Windows computer (website won't let a Linux computer even get the exe). I transferred it to my Linux box and installed it under Wine 1.1.42, which seems to be the latest that Ubuntu has available.

No errors, but also no sound from the program. I have the competitor program Musicnotes Player (also under Wine) and it does play scores fine through device "system default".

Under the Solero program, I see a variety of playback devices, except instead of "system default" it shows "Inner Soft Synth". I've tried all the other devices, but no sound.

I can't think of any other settings I could check since sound is working fine otherwise.