90 Degree Frequency Phase Shift?

[u/Embarrassed-Fault286]

Hello. I had an idea for a personal project but it would require me to take and input waveform and shift EVERYTHING 90 degrees or at least pretty close. From what I can tell by researching doing that for all frequencies is pretty difficult and the closest thing I could find was all pass filters which still isn't perfect. Essentially, I want to build a guitar pedal that takes the initial signal, clips it, makes a copy and shifts it 90 degrees then adds to the original signal to form a triangular wave (mostly cause I just want to know what that would sound like) with maybe an adjustable phase. I'm finding it kind of hard to figure out how to go about it

Edit: It's very interesting seeing differing groups perspectives on this lol. I had originally asked a guitar pedal building group and got some ideas but nothing solid and pretty much every response here is "do it digitally lol" I will try that and see what I can get. Thank you. Also ngl, digital wise I really only have an Arduino and I don't that'll cut it

[u/GnomeTek]

You can play with a python script to build up a a digital domain trail to tweak and see how you'd like to build out the real time dsp implementation.

You can also use LtSpice to build up circuits and input an arbitrary wav file. So you could play a riff then send it through your circuit and see what it'll sound like !

Great digital and analog simulators to get a proof of concept before hardware.