# VCF Envelope source switch bug 1.25

**URL:** <https://forum.udo-audio.com/t/vcf-envelope-source-switch-bug-1-25/2921>\
**Category:** Super 8\
**Created:** [26 September 2024 19:01 UTC](https://forum.udo-audio.com/t/vcf-envelope-source-switch-bug-1-25/2921 "2024-09-26T19:01:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Quatschmacher](https://avatars.discourse-cdn.com/v4/letter/q/85e7bf/32.png) [@Quatschmacher](https://forum.udo-audio.com/u/Quatschmacher)\
**Post date:** [26 September 2024 19:01 UTC](https://forum.udo-audio.com/t/vcf-envelope-source-switch-bug-1-25/2921/1 "2024-09-26T19:01:47Z")

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Just discovered a bug I think. Have found an instance where moving the VCF envelope depth slider is causing the envelope source switch to change to a different position from the one saved in the patch data. Have reported it.

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**Author:** ![trond.olsen](https://avatars.discourse-cdn.com/v4/letter/t/a9a28c/32.png) [@trond.olsen](https://forum.udo-audio.com/u/trond.olsen)\
**Post date:** [26 September 2024 22:36 UTC](https://forum.udo-audio.com/t/vcf-envelope-source-switch-bug-1-25/2921/2 "2024-09-26T22:36:13Z")

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Patch loading doesnt recall switch state. Hopefully it get fixed in next release.

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**Author:** ![Quatschmacher](https://avatars.discourse-cdn.com/v4/letter/q/85e7bf/32.png) [@Quatschmacher](https://forum.udo-audio.com/u/Quatschmacher)\
**Post date:** [26 September 2024 23:17 UTC](https://forum.udo-audio.com/t/vcf-envelope-source-switch-bug-1-25/2921/3 "2024-09-26T23:17:51Z")

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It may be the same instance. When pressing manual, the VCF envelope and filter keyboard tracking switches aren’t recalling the correct state. (This is something I’ve also reported).