"Hi, im kind of at an alright level with pure data, and im working on a project, a spectral synthesizer in pd vanilla and Ofelia,
The way im planning on handling this is to have a lowpass and a highpass squeezing in one one chunk of audio. ive realized that the lop~ object and the hip~ object have a frequency rolloff that smoothens out the cutoff over time. its like a gradual slope that gets quieter before completely choking out the audio. i am aware that this is how most filters work,
but is there a way i can have a square shape filter that just completely straight up does not let any frequencies above the limit at all? im fine with using externals if i need to, or if there's some kind of vanilla work around. it needs to be done in real time."
SOLUTION: My friend Mike Moreno found a way to do this with the "I03 resynthesis" patch, shaping the table itself with sliders and an until loop. it creates a square shape on the frequency table itself. heres the patch: resynth-1024.pd
Credits to @mianmogra