Hi,
Ok in laymens terms:
a) What does a mic preamp do.
It takes the signal from the microphone and amplifies it to a signal level which is suitable for recording at. This is a very important part of the product. The quality of the preamps determines how clean and quiet the recorded sound will be, and how true the recorded sound will be compared to the original sound. I have previously sold a BR machionie to a customer who was so impressed with the quality of the mic preamp onboard, he wrote a review about it, and had it published in our PowerOn magazine.
b) What does a guitar preamp do.
In a similar way to the mic preamp, it boosts the signal. Both mics and guitars have a very low output, which is not on it's own suitable for recording.
c) Vocal harmony? does that mean you can sing into the mic. and over lay it 4 times at the press of a button and then burn it to CD. So it is a more pleasing sound.
A vocal harmoniser can take your original recorded voice track, and create the sound of your voice singing at up to 4 different pitches, based on different pitch macros available within the unit, and chord structures you enter into it, without you having to sing each of the harmony parts yourself.
For example, a macro could say that from your voice, the harmony parts should be placed at +3rd, +5th, -5th, -Oct based on the scale of the chord you have entered for any given point in a song. Chords may be entered in step mode. If you were creating a cover version of a popular song, the chords would be listed in the score, or tab of that track. You could simply copy these into the BR1600CD.
So yes, it would be like creating four multitracked parts automatically. Of course it can be burned directly to CD on the BR1600CD, without the need for any additional hardware/software.
Regards