Clean up audio for ips modded PC Engine GT

[pipi]

Hi all,

I have just read about this:
https://www.retromodding.com/products/gba-power-cleaner

And I wonder if it could work on other consoles like pc engine gt or nomad.
I did on both an rgbdrv mod and now both product a quite strong hiss noise, more noticeable when pausing the game but once it gets stuck in your ear...
Is far from pleasing.

I thought about this or maybe build a low pass filter?

Did anyone experiment or have suggestions


Thank you!