Hi HVYamaha,
what exactly are you planning to do with a MIDI controller pedal connected to the PSR-3000?
I did a quick look into the Boss FC50 manual, and I think you can do nothing that would make sense in conjunction with the 3000. The FC50 can send Program Change messages, but only in a relatively complicated way. In addition, you can connect up to 4 external Controller Pedals / Foot Switches that can send certain Control Change (CC) messages. And finally, the FC50 can NOT used to send SysEx messages.
Therefore, in my opinion, the FC50 would be almost useless when directly connected to the PSR-3000.
Best regards,
Chris
