Initially I would like  to thank all of you, for your time spending answering me! 
 
	 
 
	Now lets clarify some blank spots about my initial query.
 
	 
 
	I am using a synthesizer (WSA1)  as my main midi keyboard, connected to my pc, through a midi-usb adapter (doremi) and everything  works fine.
 
	 
 
	Now I am using Cakewalk as DAW and I have download from spitfire Audio, the BBC Symphony Orchestra and I have learned how to set and use the instruments and record tracks.
 
	 
 
	I have create some orchestra tracks, but because after some time while recording , I don't remember every note of every instrument and because I don't read notes , I need a visual keyboard  on the screen when playback... so I can add or remove or expand my musical parts.   
 
	 
 
	Basically I have learned to play visually and acoustically and it is very important to me, to visual inspect what I have played initially.
 
	 
 
	I hope I made clear my blank spots of initial query