Hi heanchpi, I have the same problem, I made a lot of SINGLE REGISTRATIONS with a different micro's volume, I always use the micro and the vocalizer of AUDYA, the problem is that now I can't reprogram all the SINGLE REGISTRATIONS (one by one) it's the same problem that you have? I try one thing, (but I don't know if works corectly), go to MENU > KEYBOARD CONTROL > UTILITY > NEXT PAGE to 4/4 Filter Regis. VOICETR (here yo can set ON - OFF with F1 and < > (side left - right to enter). I think that this parameter filter the VOICETRON (MICRO AND VOCALIZER) in that way if you set the volume of the micro manually and after change a one SINGLE REGISTRATIONS will not change the volume of the micro, try and say me if is correct. Regards. Andreu