the BC can do this by splitting the value.
If your sysex only used a single data value you would use...
$F0 $21 $7F $00 $78 $28 $00 $00 $0F val0.6 $F7
where val0.6 is bit 0 to bit 6 and is good for 0 to 127
As this is the most common value it has the second name of just val
You can split the 14 bit value that the BC uses in various ways, but what you want is val0.3 and val4.7
$F0 $21 $7F $00 $78 $28 $00 $00 $0F val4.7 val0.3 $F7
As you are using bits 0 to 7 (8 bits) you have your range of 0 to 255.
Hope this helps
All the best
Royce
Royce