# Preventing parameter map changes to send back MIDI messages during parsing

**URL:** <https://forum.electra.one/t/preventing-parameter-map-changes-to-send-back-midi-messages-during-parsing/3822>\
**Category:** Developers\
**Tags:** lua\
**Created:** [July 21, 2025, 6:04pm UTC](https://forum.electra.one/t/preventing-parameter-map-changes-to-send-back-midi-messages-during-parsing/3822 "2025-07-21T18:04:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NewIgnis](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.electra.one/newignis/32/767_2.png) [@NewIgnis](https://forum.electra.one/u/NewIgnis)\
**Post date:** [July 21, 2025, 6:04pm UTC](https://forum.electra.one/t/preventing-parameter-map-changes-to-send-back-midi-messages-during-parsing/3822/1 "2025-07-21T18:04:12Z")

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Hi,

I’m testing parsing via own matrices (not via the parsing allocation of the webeditor) for rather complex sysex responses.

Via midi.onSysex, I manage to convert the received sysex bytes into parameter values. I do so by using the parameterMap.set function. But how do I ensure the MIDI messages are not triggered while setting those parameters in the parameter Map? After all I just received them from the Synth for parsing purposes, there is no need to send them immediately back.

what is a simple way ?