Unfortunately, the PSR-S670 doesn't have a standard 5-pin DIN MIDI output, so your options here are more complicated. There are a handful of keyboards that can act as USB hosts (Korg Kronos, Yamaha Montage/MODX for example), and you can use the PSR-s670 as a controller for those. Otherwise you'd have to add some kind of host device between the PSR-s670 and your other MIDI keyboard, liek a computer, an iPhhone/iPad, or a standalone USB MIDI host like the ones from MIDIPlus or Kenton.
HOWEVER, the PSR-S670 doesn't have MIDI IN/OUT ports, so you will need to use a USB MIDI host device to interface the PSR-S670 with the other MIDI keyboard.
There are dedicated USB MIDI host devices you can buy for this purpose, as well as certain audio interfaces that can act as USB MIDI host devices, such as-- but not limited to-- the following:
You can also connect both keyboards to a computer or laptop which will serve as the USB host and MIDI router, or possibly to a tablet, smartphone, or iPod touch if it has the proper port(s) or adapter.
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