PHaser and envelope filter need frequency limits

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?