Hi again Mike,
I don't know how many things you have to change, neither I have extensive knowledge of altering midi files (although all my covers are recorded as midi's and not as wav files)
but I don't see any new proposals so I will try to give some thoughts.
Trying to equalize the midi on the keyboard:
a) Change the EQ settings of the keyboard to something that would sound nicer to a computer and not on the keyboard (Give a little more treble and bass)
b) Play the midi and adjust all the volumes of all channels one by one while you are listening to the midi by calling the Mixing Console.
If there is a need play it again a second time,the previous changes will remain.
After you finish press Stop.
Then enter Song Creator-Channel-Set up-Execute-Save.
c) Do the same but not with the Volumes this time but the other tabs of the Mixing Cosole and effects like Harmonic,Brightness,Eq High and low for each channel.
Don't forget the pan of each channel.
The channels should not be in the center.A little to the left or right and not at the same positions so we can hear each channel more clearly.
Then again enter Song Creator-Channel-Set up-Execute-Save.
d)I believe your real problem will be the Right and Left hand voice volumes.
The same volume level for all the four different right 1 voices you may used, is not good at all.
You can enter Song Creator to the tab "1-16" and there you can see the volumes of Channel 1 voices(Right 1).
You can change the volumes of each note one by one or select a bunch of them by selecting the multi select icon+ letter A(letters J+A)
If you don't know what to change,you can go up and down and listen to the notes by pressing B (going down) and A (going up).
You will also need to press the D,E and Data Select buttons to select the volume of the notes and not change something else.
You can do the same with channel 2(right 2) voices and channel 4(left) voices.
Every little while ,press save so not to make any critical mistakes and have to start over again.
There is also a SySex comand that you can apply at specific timings of the midi so it can change the volumes as you wish but better not talk about it right now.
I hope someone may help with the midi cables (Midi in and Midi out settings-you will need 2 cables)
if you wish to make this kind of changes with one of the midi programs of the PSR tutorial main page on the pc but you can be able to listen to the results live on the keyboard with it's voices and not on the pc with the generic/standard voices.
http://www.jososoft.dk/yamaha/software.htmhttp://www.jososoft.dk/yamaha/more_software.htm
If you use a DAW or any other midi program,forget about the voices of the CVP.
You will need to change the voices to something from your pc (along with the note lengths,timings etc)
Of course you may already know all these things but maybe they will be useful to others with a model with an on board Song Creator.