Hello,

What kind of micro and audio card have you ?

The quality depends on the micro but also in many case of the micro amplifier.

There is different types of micro and a condenser micro delivers a higher signal needing less amplifying and in consequence leading to less electronic noise.
They need a 48V supply voltage.

The first step is to get a suffisant level of signal during recording, avoiding to amplify it in MMM which increases noise.

Do you get a suffisant level when you look at the signal pattern or at the vu-meter, or do you need to amplify it with a large factor?  In this case you need a dedicated sound card with micro amplifier or an external micro amplifier. 

If you use the integrated sound chip of your PC, the quality of the micro amplifier and the audio to numeric converter are generaly not very good. A sound card dedicated to music offers generaly better micro input.

After, in MMM you can apply some small compression on the voice to enforce it and also use filtering with the equilizer to include it in the music avoiding frequencies overlaps:

. low frequency <120 Hz and very high frequency >12000 Hz could be cut
. you can try to amplify a little very carefully:
. fondamental frequency 300 to 400 Hz
. sensible frequency around 2500 Hz  
. harmonics 5000 to 6000 Hz

You can also add some reverberation depending on the style.

There is a lot of article on Internet by example :

http://www.soundonsound.com/sos/1997_articles/jan97/spokenword.html

Search also mixing music about frequencies overlap management. I have some references but in French.

Nota : premium edition is not necessary.

Regards