sysex are not that difficult once you get to know them …a bit like 'fill the gap in between f0 and f7 :slight_smile:
what you refer to as ‘0n’ is not actually a value you dial in, ‘n’ is a variable you can set, in this case the MIDI channel. that’s true for all the other bytes which have letters in them (looking at manual page 9, 4-14 parameter send)
so for instance, if you wanted to send a sysex message to your kawai on channel 12 to set the cutoff at 50 for single source S1, the message would look something like this: 0xf0 0x40 0x0c 0x10 0x00 0x06 0x23 0x00 0x32 0xf7
Channel no.-> 0x0c (range 0x00 to 0x0f)
Sub status 1 -> 0x23 (decimal 35, range 0-100)
Sub status 2 -> 0x00
data -> 0x32 (decimal 50)

you need to convert the decimal numbers on the manual to hexadecimal ones to get things to work

hope this helps