Tilting depends not only from the software which you are using to fix your audio. It depends from another critical factor which is your transmitter and especially your pll. A good pll with dual speed loop is a good start in order to get rid the annoying tilt.

For good DeClipping only one thing is needed, good input tilt. I think ST is only program that has Input Tilt adjustment (standoalone), wich is ideal for analog inputs. DeClipper internaly also looks for already clipped and then tilted tracks up to 45deg by default.

Hi Bojcha.
How we could adjust the input of st ? Like tilting on fm output? By producing square wave of 60hz and trying to optimize with rc correction of input?

Hi, sorry for the slow response. What tilt basically does is, it tries to de-tilt the audio before detecting clipping. As you can see in many files, if a tilt has been introduced after clipping, then detecting clipped audio is no longer a matter of just finding samples at the same (and highest) level, but instead you need to tilt the audio first to make those peaks flat.

It's a bit hard to explain, the default settings were created based on some worst-case recordings. But there may be even worse out there that we haven't seen.

To get an idea what tilt does, you can use the RC slider for the FM output and check what it looks like on clipped audio or on square waves. The de-tilt filter basically tries to find the best RC value match for every piece (a few dozen ms) of audio.