About Casio USB connection

[drkz4ck]

Hello there, folks!

I looked for this information  on the internet, but at the end I just couldn't get any concrete information regarding my qyestions.

The deal is: If I connect whatever Casio Digial Piano i might have (Privia PX-#30 series and Celviano AP -#20 series) to my computer  through the the Piano's USB output, will it behave like an actual MIDI In/Out output?
What I want to know the most is if the sound I produce on my software through the connection will come back to my piano and come out through the piano speakers.
If it was possible I would just disable the instrument local contol and hear only the sound of the software. I know this is possible with pianos connected to a computer trough MIDI ports and I would like to know for sure if it's possible with the Casio pianos which do not hold this feature.

Before I finish, i must wmphasize I haven't found any concrete information about this on the internet.
If this was not the right place for this post, then I humbly apologize.

If it's okay: Thanks in advance! 

[quantum]

A MIDI connection is just for data - information on when to play what notes, no audio.  So if the USB connection on your keyboard is just MIDI, you will still need another cable from your computer sound card to carry the audio back to be played on your keyboard speakers. 

This is MIDI: Keyboard - MIDI out > Computer.

This is audio: Computer - sound card > Keyboard - audio in.

You probably need to mute your keyboard internal sounds if you want to play sounds from your computer.

There are some really good piano software samplers out there now, so it would be a good option to check out.

[drkz4ck]

Wow! Seems I was wrong about it after all...
Thank you for your reply.

I asked this because I'm having a really had time choosing between brands of digial pianos.
I'm looking into Caso Ap-220 and 420, but the piano samples seem to fade a little too fast for me, though I really like the action of the keyboard.
I figured it would be a nice idea to plug it to a computer and run PianoTeq - but these models I've mentioned do not have Audio Inputs.

Well, what about the MIDI IN connections... what do they do exactly then? I thought they would recieve MIDI data and actually reproduce it on the instrument itself. 

[quantum]

MIDI IN does receive MIDI data. 

You if you had multiple keyboards, you could go MIDI OUT from keyboard #1 to MIDI IN on keyboard #2.  This would allow you to play sounds from keyboard #1 as well as sounds from keyboard #2 on keyboard #2.  You could chain many instruments together like this.

You could also use MIDI IN to play back MIDI files from your computer using your keyboard sounds.  It would be Computer MIDI OUT > Keyboard MIDI IN.