# 3340 VCO sounds like a LFO, please help me!

**URL:** <https://lookmumnocomputer.discourse.group/t/3340-vco-sounds-like-a-lfo-please-help-me/1521>\
**Category:** DIY STUFF\
**Created:** [July 27, 2020, 2:45pm UTC](https://lookmumnocomputer.discourse.group/t/3340-vco-sounds-like-a-lfo-please-help-me/1521 "2020-07-27T14:45:31Z")\
**Posts on this page:** 1\
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**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\
**Post date:** [July 27, 2020, 3:44pm UTC](https://lookmumnocomputer.discourse.group/t/3340-vco-sounds-like-a-lfo-please-help-me/1521/4 "2020-07-27T15:44:53Z")

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Your coarse tuning pot may not be wired up correctly. See the drawing and the first few comments here for how and where to measure the CV inputs:

> [@Annotated Simple 1V/Oct Oscillator Stripboard](https://lookmumnocomputer.discourse.group/t/annotated-simple-1v-oct-oscillator-stripboard/1267):
>
> And here’s [the LMNC 3340 stripboard layout](https://www.lookmumnocomputer.com/projects#/cem-3340-diy-simple), with scribbles: See [here](https://lookmumnocomputer.discourse.group/t/annotated-simple-low-pass-filter-stripboard/1266) for the annotated Simple Low Pass Filter stripboard.

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