# PHaser and envelope filter need frequency limits

**URL:** <https://unity.neuraldsp.com/t/phaser-and-envelope-filter-need-frequency-limits/17562>\
**Category:** Feature Requests\
**Tags:** feedback\
**Created:** [March 12, 2025, 9:19pm UTC](https://unity.neuraldsp.com/t/phaser-and-envelope-filter-need-frequency-limits/17562 "2025-03-12T21:19:27Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![rathbun1](https://avatars.discourse-cdn.com/v4/letter/r/e0b2c6/32.png) [@rathbun1](https://unity.neuraldsp.com/u/rathbun1)\
**Post date:** [March 12, 2025, 9:19pm UTC](https://unity.neuraldsp.com/t/phaser-and-envelope-filter-need-frequency-limits/17562/1 "2025-03-12T21:19:27Z")

</div>

i’ve tried all the phaser and envelope filter options.

what i would really like to see is the addition of two parameters.

low frequency sweep limit and high frequency sweep limit.

when i hear a sound in my mind i hear it sweeping form a low frequency ( like 200hz or 400 hz. and if it goes too far or not far enough it’s not doing the “thing” i want.) to a high frequency (and again sometimes 2k is perfect. other times i want it to go all the way to 4k. the difference is huge)

there are various controls which sort of get at this, but i find them overly broad. like we are supposed to be able to make this adjustement with just one parameter?