Thanks to Red Dot Forever free recording software (and this forum), I can now record to my laptop. However, I don't have "strings, organ" and any other sounds on my laptop. So when I play back a song I have recorded and played using "strings" or some other instrument sound, I can't get the recording to play back that instrument...only piano.

Is there a free, simple software I could use that would include varying instruments so that when I play my CA91 my recordings will play back the same instrument I recorded? What is this software called? I'm new to the DP world, so please bare with my ignorance!

You can do it this way:
http://www.originalsolopiano.com/how-to-convert-midi-to-mp3.html

Or, don't record as MIDI but as actual audio:
http://www.originalsolopiano.com/how-to-record-piano.html

Thanks mahlzeit! I can tell I'll need to read the info a few times.And when I'm back at my Digital Piano, I'll try it out tonight. I'll re-post my results.