# Effects on master out

**URL:** <https://in-thread.sonic-pi.net/t/effects-on-master-out/1565>\
**Category:** Support, Help & Resources\
**Created:** [October 11, 2018, 8:27pm UTC](https://in-thread.sonic-pi.net/t/effects-on-master-out/1565 "2018-10-11T20:27:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Paum](https://avatars.discourse-cdn.com/v4/letter/p/dc4da7/32.png) [@Paum](https://in-thread.sonic-pi.net/u/Paum)\
**Post date:** [October 11, 2018, 8:27pm UTC](https://in-thread.sonic-pi.net/t/effects-on-master-out/1565/1 "2018-10-11T20:27:28Z")

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Hi all, maybe this question was answered somewhere but I couldn’t Google it. What effect are on main output? There is limiter for sure and what else ? Is somewhere any info about it ?

Thank you  
Paum

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**Author:** ![samaaron](https://dub1.discourse-cdn.com/flex017/user_avatar/in-thread.sonic-pi.net/samaaron/32/7_2.png) [@samaaron](https://in-thread.sonic-pi.net/u/samaaron)\
**Post date:** [October 11, 2018, 10:25pm UTC](https://in-thread.sonic-pi.net/t/effects-on-master-out/1565/2 "2018-10-11T22:25:14Z")

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There’s a limiter, low pass filter, high pass filter, a DC leak fix and pre and post amp gain stages.

The design is here: [https://github.com/samaaron/sonic-pi/blob/master/etc/synthdefs/designs/sonic\_pi/synths/studio.clj#L21](https://github.com/samaaron/sonic-pi/blob/master/etc/synthdefs/designs/sonic_pi/synths/studio.clj#L21)

You can manipulate the parameters for the mixer (including bypassing various stages) using the fn `set_mixer_control!`. The docstring includes basic info for all the various options.