Creating negative possitive through sysex

hello i have a Marion MSR 2
the editor is almost ready to upload
i have only one issue
i used the midi learn button (it found immediately the sysex)
but some faders have negative to positive -99 to 99
i tried value -99 0 99 on top
and below from 0-127
but i doesn’t work
any advice?
best Dim

This latest post/thread has some info related, I think :wink:

Dear keymanpal i tried already that but still doesnt work

I’m afraid I cannot help much beyond the ideas on that thread…
Maybe some one else here with knowledge over SysEx?