It seems like about half of the hes files I've tried work at all. I've now figured out that sometimes the way that the bad ones crash affects the hardware and nothing will play again until I power off the console.
I've had mixed results with hes files, hes files renamed to .pce and hes files converted to sound roms with that one app. Some soundtracks only play on one of those three formats, but it's random from game to game.
After narrowing things down further today, I've found that I got more overall to play at all using the v1 TED, but some played better and possibly perfect using the v2 TED.
I wish I had the skills to convert files for your Visual HES Player. :/