# Preset system : questions

**URL:** <https://forum.cabbageaudio.com/t/preset-system-questions/762>\
**Category:** Csound Noobs\
**Created:** [15 October 2017 08:42 UTC](https://forum.cabbageaudio.com/t/preset-system-questions/762 "2017-10-15T08:42:25Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Karamel1](https://forum.cabbageaudio.com/user_avatar/forum.cabbageaudio.com/karamel1/32/1680_2.png) [@Karamel1](https://forum.cabbageaudio.com/u/Karamel1)\
**Post date:** [16 October 2017 09:16 UTC](https://forum.cabbageaudio.com/t/preset-system-questions/762/5 "2017-10-16T09:16:06Z")

</div>

Somehow the changed opcode does not respond when filebutton is set to snapshot mode :  
`if changed:k(chnget:S("filebutton")) == 1 then` does not give any signal and `if changed:k(chnget:k("filebutton")) == 1 then` give an error :

```
 INIT ERROR in instr 2: channel already exists with incompatible type
#k0	chnget.k	"filebutton"
```

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