# Mixer designs: signal levels

**URL:** <https://lookmumnocomputer.discourse.group/t/mixer-designs-signal-levels/1916>\
**Category:** Uncategorized\
**Created:** [October 2, 2020, 8:20am UTC](https://lookmumnocomputer.discourse.group/t/mixer-designs-signal-levels/1916 "2020-10-02T08:20:03Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [October 2, 2020, 12:49pm UTC](https://lookmumnocomputer.discourse.group/t/mixer-designs-signal-levels/1916/7 "2020-10-02T12:49:09Z")

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All the synth mixer modules I’ve seen have attenuators on the inputs, before any gain stage, and usually also on the output(s). E.g. the AI Synthesis mixer:

 ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/b/ba8d83db2148022f60056e38e4429b6d9292e1e3.jpeg)  
 ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/1/1d03a286460d785dfe9ce14915230c646c82fbe7.png)

_Added:_ Also, note use of inverting amplifiers so the inputs do not approach the ±12V rails.

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