Sorry for not responding sooner, I have been extremely busy with the IBC last week.
Diff -> correct
Oversampled -> Close. Say you have sample values 2, 10, 10, 2. Then if you double the sample rate, you'll get something like: 2 6 10 12 10 6 2. If you clip at level 10 without oversampling, then the peak to 12 would be completely invisible and hence not be clipped - the analog output signal would still contain this peak. Oversampled clipping works at 4x the sampling frequency to remove almost (except the last 1% or so) all these between-sample spikes. It's not enabled by default because it takes more CPU load and it hurts the audio quality a bit more, because more peaks get clipped. But if you have a sound card or other output that cannot handle these between-sample spikes, or if you're going to resample the audio afterwards, you really need to turn it on.
For FM you always need 4x oversampling to stay within legal limits, so this checkbox is disabled when you're using FM output.
"Also low frequencies" - use composite clipping instead of traditional clipping on lows. Probably has very little effect, but does increase CPU load. Theoretically it should be better though.
"Multipath clipper" is an experimental feature comparable to Stokkemask clipping, except that it works identically on all frequencies (Stokkemask has more effect on the extremes at +/- 75 kHz). Since you found that Stokkemask helps for these high frequency issues (other post), I would be really curious if you could also test:
- Different levels of Multipath Clipper (that's what the 200% slider is for)
- Single sideband stereo, all 3 modes (skip "Extreme", it's only there for some theoretical reasons but it causes issues).
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