Phantom power switch inside the M4 and external extra switch

In the M4 there is the push switch near the midi connector that can allow or disallow the phamtom power to pin 4 and 5

Do you know if its on when the button is inside (down) our outside (up) ?

On my M4 i've go too an external switch near the tubes and do you know what is it for ? It seems to switch off the fan but is standard or customize ?

Thanks for you answer

On the M4 you could email Egnater to find out. I don't have an M4 myself.
It might be useful to you to buy a Digital Multimeter so that you could test for voltage at pins 4 and 5 to verify the presence of voltage there. Of course the meter would be useful for many other things. If you ever acquire an RM100 or RT2/50 or an RM50 it would be necessary to set the bias to the power tubes. Sorry I can't give you a better answer.