From the YamahaSynth article “Sequencing with reface CP/CS/DX/YC”.... found in the “Learn” area of this site....

Capturing the reface CP/CS/DX/YC Settings

While the reface DX has the ability to store and easily recall Voices and setup Functions, the rest of them are very much real time - harkening back to a time pre the ability to store and recall programs via Program Changes. Fortunately, the reface units (all of them) can be sent a message called a "Bulk Request" which causes the instrument to send a packet of information that can recall the current settings. Below we'll give you the information you can insert into the Motif XF sequencer prior to recording the reface to a track guaranteeing that the reface CP/CS/DX/YC will sound exactly as you intend when you restart this sequence.

Type the Bulk Request command in a measure attached to the front of the sequence.
Set the track to OVERDUB Record (this will allow the message to be sent, received by the reface, the bulk information to be returned and recorded to this extra measure.
In lieu of a Program Change, this small packet of coded messages will allow the initial setting for your reface to be documented in the sequence track data.

F0 43 20 "reface Product ID" 0E 0F 00 F7

F0 always denotes the Start of an Exclusive message
43 (four-three) is the Yamaha Manufacturer ID
20 (two-zero) is the Parameter Bulk category

reface Product ID
CS = 7F 1C 03
CP = 7F 1C 04
DX = 7F 1C 05
YC = 7F 1C 06

0E 0F 00 = the bulk request
F7 always is the End of an Exclusive message

Examples:
F0 43 20 7F 1C 03 0E 0F 00 F7 is the message that will cause the reface CS to bulk dump its current setting...
F0 43 20 7F 1C 04 0E 0F 00 F7 is the message that will cause the reface CP to bulk dump its current setting...
F0 43 20 7F 1C 05 0E 0F 00 F7 is the message that will cause the reface DX to bulk dump its current setting...
F0 43 20 7F 1C 06 0E 0F 00 F7 is the message that will cause the reface YC to bulk dump its current setting...

By using OVERDUB RECORD you can ensure the start condition of your particular reface... Upon receiving the Bulk Request the reface will dump its settings, and you can begin music recording at the top of the next measure- do not attempt to send and receive bulk data during music playback, it can and will adversely affect timing. Bulk Request should always be done prior to the beginning of music playback.