According to some of HuC6280 clock is 21477270/3=7159090 "source (Timer.cpp)" of Ootake.
I seem to let the operation clock is divided by 3.
I'm a slow tempo it clock 8055000.
I think I might become the correct tempo 32220000/3=10740000.
I think it will be fit also calculate YM2151 the clock 3580000x3=10740000.
sample Rohga - Demo:
http://www.mediafire.com/?vieu9tn7gxh27fc
rohga_ost.mp3 is Sound Track CD
rohga_hoot.mp3 is Hoot Recording (Tempo is faster than the OST)
rohga_M1.mp3 is M1 Recording (Tempo is slow than the OST)
I seem to be operating above the clock 10740000, I do not know of Hoot.
Edit:
I've found a video that was recorded from the actual arcade board.
http://www.youtube.com/watch?v=6KhqOP1KrNg
It is a sample of the data recorded in MAMEPlus. (MAMEPlus can be set to 400% Overclock CPU)
http://www.mediafire.com/?bkuabhcxrjer5ck
Rohga_300%.mp3 is 300% Overclock CPU (8.050 MHz)
Rohga_400%.mp3 is 400% Overclock CPU (10.740MHz)
I seem to be running at 10.740MHz Judging from this video.