Use a synthetic Sysex message on the controls, and use Sb to assemble
X control: Sysex: 59 V, one byte, no checksum, midi values as desired
Y control: 5A V, ditto
Streambyter rules:
# Combine two synthetic Sysex messages to single message
If load
Ass I2 = 0 # Initialize x value, adjust as desired
Ass I3 = 0 # Initialize y value, adjust as desired
End
If M0 == F0 59 # Synthetic Sysex for x value
Ass I2 = M2 # Capture x value
Snd F0 7F 7F 03 I2 I3 02 18 08 F7
FX = XX +B # Block outbound syn sysex
End
If M0 == F0 5A # Synthetic Sysex for y value
Ass I3 = M2 # Capture y value
Snd F0 7F 7F 03 I2 I3 02 18 08 F7
FX = XX +B # Block outbound syn sysex
End