I share my setting with you, these days I worked on a preset in the spirit of treatments fm omnia.
I used the example of french radios (forget the 75U), skyrock for example, which has the heaviest sound processing in France
I have soon a frequency in FM and I look at the available solutions.
I tested with a transmitter for iPod (Belkin I think), I have attached a sample of what it gives
if you have a crappy sound on FM, do different settings in the calibration of the transmitter
you can adjust the agc (in the sample, i I tried different settings : 25 to 40)
I have a very good treatment of bass (FM only : very clipped) but I have little problem in the high frequency (just beta okay xD)
tell me what do you think about this (I specified, for fm..)
>>
Link
>
Preview Sample