I’ve loved my PSR-220 for the entire time I’ve owned it, for the last 30 years, almost. It’s now malfunctioning, though- and I’ve been unable to find a new keyboard to replace it that has all its features: a standalone model with stereo speakers that can run on batteries, with 61 full-size keys and full midi capability. (In/out/through.) Since buying a new model that equals this seems to be impossible, can anyone recommend a newer keyboard released, say, in the last 20 years with all these functions? Thanks.