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I’m complete ignorant about the type and brand of the synth.
IF the value of the modulator is only one byte and IF there is a checksum needed, then every sysex command could look like this.
Option 1 Sysex F0 18 0F 00 55 01 02 05 01 xx z5 F7
Here the z stands for a Roland type checksum (there are other options ) and the number 5 stands for the number of bytes (placed before the checksum byte) the checksum will take in account to produce itself.