# DSI PolyEvolver bottom octave not responding

**URL:** <https://forums.syntaur.com/t/dsi-polyevolver-bottom-octave-not-responding/4150>\
**Category:** Synth Repair\
**Created:** [March 24, 2022, 6:02pm UTC](https://forums.syntaur.com/t/dsi-polyevolver-bottom-octave-not-responding/4150 "2022-03-24T18:02:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Realpancake](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/r/c6cbf5/32.png) [@Realpancake](https://forums.syntaur.com/u/Realpancake)\
**Post date:** [March 24, 2022, 6:02pm UTC](https://forums.syntaur.com/t/dsi-polyevolver-bottom-octave-not-responding/4150/1 "2022-03-24T18:02:13Z")

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Hi, I had a few dirty contacts that were causing notes not to work on my PEK so I took it apart and cleaned them this afternoon. All of those notes are now responding again but the lowest octave is now not responding at all - does anyone know what might cause this with a (presuming) Fatar tp/9s keybed? Never had this issue before…

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**Author:** ![Realpancake](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/r/c6cbf5/32.png) [@Realpancake](https://forums.syntaur.com/u/Realpancake)\
**Post date:** [March 26, 2022, 7:46am UTC](https://forums.syntaur.com/t/dsi-polyevolver-bottom-octave-not-responding/4150/2 "2022-03-26T07:46:54Z")

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So it turns out it was a simple error - I put the silicone key contact strip on the wrong way. Easy fix!