In a track, there is a volume slider you can move with the mouse:
 

 
In this image, the volume of the MIDI track is (101), in the audio track it's 0.0. Move those sliders to change the volumes.
 
Or you can click Views at the top and select Console to bring up a Mixer view like this:
 

 
Here you can easily see all the volume settings and change them if desired.

I would HIGHLY recommend watching these videos  >>>>  http://www.cakewalk.com/CakeTV/Music-Creator.aspx

Cake put them here to help people understand the basics of the MC software. 

It may help to answer your question...

What a lovely thing for you to do!  Thank you.  Just out of curiosity - what program were you using?  I did not know to do that because when I had the old Panasonic with a mic on a towel on top of it, I didn't have to!  Therefore, I thought that I could simply record the 2 tracks without any fuss, switching from audio to MIDI. 
At your suggestion, I recorded an audio track at 30 on the receiver.  That's the norm.  Now in order to record the MIDI flute while listening to that track, I had to put the receiver up (40-42) and then go in to console and back the audio track down so they would be equal.  This worked, altho I have to be very careful or the receiver drops out.
So now I do have a way to do it.  What has surprised me all along is that the keyboard instruments are so faint unless I turn everything way, way up.  Its volumes and the receiver's.  Doesn't seem right, somehow.  For example, I could never do really loud drums (which I can hardly imagine would come up in this work!) because the receiver would "protect" and quit.
It just never occurred to me that one would have to do it this way, b/o previous experience.
So thank you!  I can get along this way.  Sister

Dear Guitarhacker,
You have all been such dears - so kind to a little old nun!  You have spent a lot of time, which I appreciate.  Yes, I have always wanted to see the videos, but way out here I can only have dialup, which excludes those.  I have printed out quite a bit.
If you read my reply to 57 Gregy, you'll see where this rests.  I can go on this way altho, as I said to him, I still wonder about the 49i volume. 
Thank you again.
Sister 

Hi sister - sorry, I didn't mean to get irritated.  Yes, I do remember you from years ago.

Ok, first, another question - you said the piano is not acoustic, and not connected to anything.  what exactly is it, then?  (and we may be just getting stuck on "terminology").  an "acoustic piano" is any piano which has to be tuned by a professional tuner, like uprights or grands or baby grands, etc.  is that what your piano is?

now, to adjust the levels on your MIDI and piano tracks look at these pictures below.



first, click on the number for the audio track to select it.  then use the slider to reduce the volume of the audio track (your piano)




then click on the number for the MIDI track and increase the volume of the MIDI track by raising the slider .



now you can adjust the overall volume of both tracks mixed by adjusting the MAIN slider.

oh, actually I see the others beat me to it while I was working on the pictures!

Dear Beagle,
That is so nice.  I have printed out all examples.  Yes, of course you are right.  Every time someone said acoustic, I immediately thought electronic, as evidenced by one of my answers.  For no reason at all!
Before I leave you to, no doubt, help others as graciously and unselfishly as you have me, (why, why didn't I ask you guys 2 years ago?), just a couple of unimportant queries:
On the MC5, if one does Track>Properties>Volume (which was one of the ways I was trying to solve my problem), one is presented with a +/- box with a 0 in it.  One can only go +, obviously.  So one adds something, plays on the track, nothing changes and the box is back to 0.  Just curious.  It really doesn't warrant digging in to.
When I finish a track, I export it to My Music and Windows Media Player.  I can then add it to a playlist for a cd.  Very simple.  What is the best way to export together the 2 tracks?  One hears them together very nicely.
Again, thank you all for all your help.  You can't imagine what it means afer all this time!  Sister

We are happy to help, Sister, come back any time you need help and we will do our best to try!

as for the TRACK>PROPERTIES>VOLUME, I'm not sure, I can try to look at that tonight when I get home from work, or maybe Greg or Herb or someone can look at that for you.

for your other question - I assume you want 1 track to play immediately after the 2nd track but on the same file?  if that's the case, you could export both of them, then create a new project in MC5, then import both of them, one after the other on the same track, then export again.

Sister Maria,
I looked at the volume thing and also realized that if you're using MC5 then it's different than MC6 and the screenshots I gave you above are for MC6.  if you're using MC5, then the volume is adjusted by a slider, but it looks very different than MC6's sliders.

in MC5, open the properties of the track you want to adjust by clikcing on the little down arrow: 

 
 
 



then use your mouse to click and drag the volume up or down on the volume slider: 

 



as far as your question:  the TRACKS>PROPERTIES>VOLUME
DOES do the same thing as above, but it looks very different and the numbers are very different.  0 = OFF and 127 = highest possible volume (+6dB).

personally I wouldn't use the volume that way, it's unintuitive to me, but it does still work.

Good to see folks stop by and update things. The guys here are so good at this process. When you stick with a program through time, it gets easier and clearer.

I got very comfortable with Real Band as my DAW due to the time i spend making live performance tracks, and now it is just the easiest for me personally. If I need more power, i just crack open Sonar X-1 Essentials. i really like that program now as well.

Thanks for the comments on my old tunes, i do have a hankering to write again. Hopefully a blade , er  a song will choose me!