Question about recording...

[SirSteinway]

Can I connect my digital piano to my computer and record directly onto the computer?  If so is there any free software on the net that will allow me to do so?  Thanks!

[quantum]

Yes, you just plug line out of your digital to line in on your soundcard.  Use Audacity to record and edit. 

https://audacity.sourceforge.net/

[SirSteinway]

Do I use a midi cable? 

[SirSteinway]

BUMP

Do I use a MIDI cable to connect my keyboard to the back of my soundcard to record?

[JPRitchie]

To do as you ask, you will need an interface card with both audio-in and MIDI-out, as a minimum. Your keyboard has to have a MIDI-in and audio-out. Connect out's to in's. Not all keyboards have an audio out; if this is the case, you can still use a hand-held recorder. Not all interface cards have both audio and MIDI.  You need software to drive the MIDI and record and, possibly, mix, edit, and master a CD.
I've worked up a short course on this subject; see: https://ourworld.compuserve.com/homepages/jpritchie for additional information or contact me via private e-mail (jpritchie@compuserve.com) . There are a lot of possibilities for using computers etc.; but sorting through all the options without losing sight of the music can take a bit of work. But, the simplest thing is to just use a small hand-held recorder.

Regards and good luck,
Jim Ritchie

[Dazzer]

Decide->

1) KEYBOARD MIDI OUT to COMPUTER MIDI IN
This requires a soundcard with a midi IN. and a keyboard with a midi OUT (most have them).
- Result -
When you record, you're recording MIDI. Doesn't sound the greatest. I wouldn't recommend this. UNLESS you follow on with
2) COMPUTER MIDI to SEQUENCER
This requires a computer with midi ( and the midi file that you record) and a sequencing program. Also some good vst instrument sounds (garritan personal orchestra's STEINWAY is what i use at the moment)
- Result -
Varies, depending on how good your sounds are. and how good your computer is. And its not perfect either. Still sounds like a computer.
3) KEYBOARD AUDIO OUT to COMPUTER AUDIO IN
This requires the keyboard to have an  audio out. IF this is not the case (ie midi keyboard) you can also get a system with a MIDI IN (can't remember the technical device name) that takes midi input and plays it as a sound. And use its AUDIO Out. Connect to the computer audio IN, and use a audio recorder that'll record it. You'll also need a special cable to convert the keyboard's bigger JACK to the smaller headphone jack.
- Result -
AGain this varies, depending on your keyboard. If you have, say, a Yamaha Disklavier, you'd be getting pretty okay results. If you've got a synthesiser, it'd sound so so ish, but not to the standard of an actual piano.
4) KEYBOARD AUDIO to ANALOG RECORDING
Simple. Play on keyboard, get a tape recorder. Convert to CD. Okay, maybe not so simple... you'll need a hell of alot of equiment. Maybe invest in a sony handycam. Direct recording to DVD, and you get video too.