# SL13 and previewing

**URL:** <https://forums.steinberg.net/t/sl13-and-previewing/1040972>\
**Category:** SpectraLayers\
**Tags:** issue\
**Created:** [September 10, 2026, 12:04pm UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972 "2026-09-10T12:04:40Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Marshall](https://dub1.discourse-cdn.com/steinberg/user_avatar/forums.steinberg.net/marshall/32/321344_2.png) [@Marshall](https://forums.steinberg.net/u/Marshall)\
**Post date:** [September 10, 2026, 12:04pm UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972/1 "2026-09-10T12:04:41Z")

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In SpectraLayers 12 I could try different settings in the Unmix modules with the Preview button. Even Unmix Song in fastest mode worked.

Not anymore

In SL13 I get the ”CPU too slow for real-time preview” message and preview is not possible anymore for several modules where it previously worked. Not even the DeNoise preview works anymore.

What’s the reason for this? Have those functions become more processor intensive in 13 , and if so, are the results now better than before when applying the functions?

MacStudio Max M1 64 GB.

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**Author:** ![ColdSteel](https://avatars.discourse-cdn.com/v4/letter/c/ce73a5/32.png) [@ColdSteel](https://forums.steinberg.net/u/ColdSteel)\
**Post date:** [September 16, 2026, 9:24am UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972/2 "2026-09-16T09:24:55Z")

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Same problem here on PC with a Geforce 3060 selected. Shouldn’t be a problem for the GPU to handle a simple preview but it doesn’t work.

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**Author:** ![Marshall](https://dub1.discourse-cdn.com/steinberg/user_avatar/forums.steinberg.net/marshall/32/321344_2.png) [@Marshall](https://forums.steinberg.net/u/Marshall)\
**Post date:** [September 16, 2026, 11:54am UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972/3 "2026-09-16T11:54:41Z")

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I found now, after reading @Robin_Lobel’s answer in an other thread, that some modules have new features regarding horizontal and vertical smoothing. If I set those to the lowest possible value (1 pixel) it makes previewing in the DeNoise module possible again.

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**Author:** ![Robin\_Lobel](https://avatars.discourse-cdn.com/v4/letter/r/d26b3c/32.png) [@Robin\_Lobel](https://forums.steinberg.net/u/Robin_Lobel)\
**Post date:** [September 16, 2026, 12:26pm UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972/4 "2026-09-16T12:26:22Z")

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@Marshall a big optimization of the DeNoise module is coming in the next patch.

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**Author:** ![Marshall](https://dub1.discourse-cdn.com/steinberg/user_avatar/forums.steinberg.net/marshall/32/321344_2.png) [@Marshall](https://forums.steinberg.net/u/Marshall)\
**Post date:** [September 16, 2026, 1:34pm UTC](https://forums.steinberg.net/t/sl13-and-previewing/1040972/5 "2026-09-16T13:34:42Z")

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That’s great!