"Known issues" in MSX Banzai!
xak 1 sound corruption causes game to fail
What sound corruption? 
What sound corruption?
Every time a new screen is shown during the demo the lighning effect has sound. But this, at least in my OCM, does not sound correctly as in my real turboR.
I hope this help you!
I have to check if following does not work in previous versions of firmware, but with latest version F1 Spirit, in 2 players mode has a problem. In the middle you have a vertical bar which shows the position of each player. The bar for the 2nd player does not show the position of that player!
The bar for the 2nd player does not show the position of that player!
It is not certainly displayed.
There seem still to be some problems in sprite.
Great that you've found that bug. 
Other games which don't work with latest version of HRA's firmware (I don't know if they will work with previous ones):
1. Rune Master II will freeze after pressing SPACE bar before the players´ menu [the scroller stops and the music keeps an infinite beep]. It freezes using 3.58MHz while it works by forcing 10MHz after booting the game. Really strange.
2. Fray MSX2: This game works but has no sound during intro/game. This game runs smoothly with 10MHz but also no music.
I will continue testing some other games.
Hmm, in my OCM most of arcade games or shooters are unplayable because of the "shitty" keyboard... or is it because of the OCM?
I've tested Aleste Gaiden [Disc Station Special 4 - Autumn Edition] and I can only go up-right and shoot, other possibilities of moving&shoot won't work (left-up, left-down and right-down) if 3 keys must be pressed at the same time. The third key was, of course, SPACE bar.
By the way, this game freezes if you want to continue (only if 10MHz is present).
PS: If it is because of a bad PS/2 PC keyboard... do you know good ones OCM compatible which can play MSX games??? 