# Roland Gaia Sysex Message Checksum Calculation Issue

**URL:** <https://forum.electra.one/t/roland-gaia-sysex-message-checksum-calculation-issue/4052>\
**Category:** General discussion\
**Created:** [November 28, 2025, 1:27pm UTC](https://forum.electra.one/t/roland-gaia-sysex-message-checksum-calculation-issue/4052 "2025-11-28T13:27:41Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Electrolove](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.electra.one/electrolove/32/2440_2.png) [@Electrolove](https://forum.electra.one/u/Electrolove)\
**Post date:** [November 28, 2025, 1:27pm UTC](https://forum.electra.one/t/roland-gaia-sysex-message-checksum-calculation-issue/4052/1 "2025-11-28T13:27:41Z")

</div>

This is a sysex message for Roland Gaia Distortion Type 1 value 0.  
F0 41 10 00 00 41 12 10 00 04 09 08 00 00 00 6F F7

If I understand it correctly this is the bytes that should be calculated on (in bold).  
F0 41 10 00 00 41 12 **10 00 04 09 08 00 00 00 6F** F7

_Including the checksum in the calculation feels a bit strange._

So in the sysex editor the start should be **7** and the length **9**.  
Is this correct?

If I use the Gaia editor from momo [https://roland-gaia-sh-01-sound-editor.jimdofree.com/#link1](https://roland-gaia-sh-01-sound-editor.jimdofree.com/#link1) The checksums do not match. My checksum is **3C** and checksum from the editor is **6F** (as in the example) for the value of 0.