Where can i get a ctk 481 driver - Casio Keyboard Ctk-481 Ctk-631 Ctk-651

I can't find the steps in the manual, but believe it is similat to
https://www.youtube.com/watch?v=ALVWsFG_d9A

Is it broken to pieces or just came off.
I would open up try glue to pieces together and then swap the repaired key F4 with say the (less used) F6 key.

PC drivers available at Casio
http://support.casio.com/en/support/download.php?cid=008&pid=20

If you have a MAC google casio driver for Macs by 3rd party.

Buy sustain pedal made for CASIO or switable model.
Pedal for Yamaha or Roland will work in reverse on a Casio.
If you cannot return for exchange, then open up and solder a different type of micro switch.

I prefer, only in CASIO authorized service

free casio ctk-2100 usb driver download now

How can I find the metronome button in casino CTK-481

Most of these keyboards have such a function... the manual doesn't show any... however one could select drum set 5 and use the claves setting for a rhythm and control the rate with the tempo. This might be too complicated and it might be simpler to get a small metronome... some are very inexpensive.

Make sure you have set the powerchord/MIDI to the MIDI mode.