I am looking for a used keyboard. If possible, below RM500. Criterias:
1) Portable 61 keys. ( I don't want anything bigger or smaller, 5 octaves is just nice for my purpose)
2) Compact
3) 48 polypony channels
4) Touch response(if possible).

Main purpose is to play together with my son.......already got a digital piano.

Can up budget if the product is good or new units. But basically i try not to overbudget......just for secondary usage...