How can I feel the difference between MSX-AUDIO and MSX-MUSIC?
I have Panasonic FS-CA1 but I don't know how to test it.

Would please recommend me some utiliities or games which can show the power of MSX AUDIO?
And as for games, what is the priority if they support both MSX-AUDIO and MSX-MUSIC and there is MSX-MUSIC installed in MSX and MSX-AUDIO in slot?

Games --> Gorby's pipeline, from Compile. That's afaik one of the very few games that support a real MSX-Audio. MSX-Music (FM-PAC, PAC, FM-Ship, FM-Stereo-PAK, all those and more!) is much more often supported. Try any music disk, and you'll notice the nice OPLL tunes. I don't know whether the genuine MSX-Audio is identical (except for the MML support) when compared to a Philips or Toshiba MSX-Audio.
Anyway, MSX-Audio noises rule over MSX-Music ones, because the FM-instruments of the MSX-Audio (OPL1) are way better. I heard it has 2 operators per voice, and FM-PAC + equivalents only have one... But I'm no expert when it comes to anything that makes noise.

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And as for games, what is the priority if they support both MSX-AUDIO and MSX-MUSIC and there is MSX-MUSIC installed in MSX and MSX-AUDIO in slot?

They'll both supported then. That's the 'pseudo-stereo'-effect everyone complains about . You can then put FM+PSG on the left and AUDIO on the right, for example. All moonblaster music can be played in MUSIC, AUDIO and STEREO, so FM+AUDIO will sound simultaneously then.

Nope, wrong...

Most Compile games (not just Gorby's Pipeline) support MSX-AUDIO, and it will take precedence over MSX-MUSIC.

And about the instruments, it's the other way around. MSX-MUSIC FM instruments can be more complex and are therefore better. The only problem is you can only play 1 user defined instrument at a time, while MSX-AUDIO can play 9 of them.

To test the Panasonic MSX-AUDIO, you must make difference between the FM part and the sample part :

- for the FM part, you can use MSX-MUSIC BASIC programs, but you must replace CALLMUSIC by CALLAUDIO without changing the parameters

Generally it will work, but you can have some problems if the program uses the 63th instrument of MSX-MUSIC

- for the sample part, as the instructions seem be almost the same than the PCM BASIC of Turbo-R, you can try parts of BASIC programs for Turbo-R, that use PCM (maybe some adaptations are required)

The problem for non-Japanese users is the fact that the Panasonic MSX-AUDIO cartridge was almost only sold in Japan, it was a very expensive cartridge and only some fans have developed programs that use all the features of this cartridge (I've forgotten to mention the commands for using an external music keyboard ...)

How can u swith the msx2+ panasonic to 6mhz by i/o , have somebody these instructions how to do that? plss help me

You can switch in Basic the clock speed in these machines :

5,3 MHz mode - out 64,8: out 65,0
3,5 MHz mode - out 64,8: out 65,1

It seems that the FS-A1FX uses also another command :
OUT&H41,154 but I don't know really his utility

From another thread in MRC forum (don't ask where, MRC search engine is a pain .... no distinction between news and forums !) :

Panasonic A1-WX/WSX/FX extension
#40 = 8 (Panasonic manufacturer ID)
#41 bit 0 = 0: High speed mode (switch to 5.37MHz mode)
bit 0 = 1: Low speed mode (regular 3.57MHz mode)

LD A,8
OUT (040H),A ;out the manufacturer code 8 (Panasonic) to I/O port 40h
IN A,(040H) ;read the value you have just written
CPL ;complement all bits of the value
CP 8 ;if it does not match the value you originally wrote,
JR NZ,Not_WX ;it is not a WX/WSX/FX.
XOR A ;write 0 to I/O port 41h
OUT (041H),A ;and the mode changes to high-speed clock

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From another thread in MRC forum (don't ask where, MRC search engine is a pain .... no distinction between news and forums !) :

I answer to myself :LOL

It's always better to use directly Google !

http://www.google.be/search?hl=fr&q=%22MSX2%2B%22%2BPanasonic%2BZ80%2Boverclocking&btnG=Rechercher&meta=

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You can switch in Basic the clock speed in these machines : 5,3 MHz mode - out 64,8: out 65,0 3,5 MHz mode - out 64,8: out 65,1 It seems that the FS-A1FX uses also another command : OUT&H41,154 but I don't know really his utility From another thread in MRC forum (don't ask where, MRC search engine is a pain .... no distinction between news and forums !) : Panasonic A1-WX/WSX/FX extension #40 = 8 (Panasonic manufacturer ID) #41 bit 0 = 0: High speed mode (switch to 5.37MHz mode) bit 0 = 1: Low speed mode (regular 3.57MHz mode) LD A,8 OUT (040H),A ;out the manufacturer code 8 (Panasonic) to I/O port 40h IN A,(040H) ;read the value you have just written CPL ;complement all bits of the value CP 8 ;if it does not match the value you originally wrote, JR NZ,Not_WX ;it is not a WX/WSX/FX. XOR A ;write 0 to I/O port 41h OUT (041H),A ;and the mode changes to high-speed clock

thanks, one question about this command, if i reset my panasonic 2+ computer with 5.37MHz mode, will at stay this 5.37MHz mode or the computer will start in teh standard mode of 3.57MHz mode?

I would guess it goes back to 3.58MHz on a reset, but it shouldn't be too hard to find out...