Kito1984 wrote: ↑
October 11th, 2020, 3:48 am
...why I don't see any clipping in Rockman with PSIO?!
That's because you can't rely on Audacity's Find Clipping function to tell you when there's clipping unless the sample itself is actually exceeding 0dB. If you were to rip the same audio sample from the disc, you'll see the PlayStation itself clips all of the music due to applying too much gain via the ATV registers.
You used digital audio for your recordings, right? The distortion from the extra clipping is clear as day to me in both V-Rally 2 and RockMan 6 Complete Works (this one produces the exact same distortion I get from my own PSIO and SCPH-5501 PlayStation's analog output). The Destruction Derby 2 sample doesn't exhibit any clipping whatsoever (it does, however, seem like your digital recordings are a bit too loud compared to the raw samples).
Now let me show you the clipping differences between your PSIO RockMan 6 Complete Works sample, my own samples from my PSIO and running the disc on the system, and the raw samples from the disc, all volume-matched to the raw sample.
Here's the waveform of the raw sample from the disc:
Now here's the waveform out of the PlayStation's audio hardware using the disc (SCPH-5501 system used) - notice how much of the sample is clipped:
Using the PSIO on the same system produces a waveform with even more clipping like so:
And the waveform from your own sample produces the same amount of clipping as my PSIO analog capture:
This is the sort of thing to look out for when investigating excess clipping as a result of the ATV registers applying too much gain to a game's streaming audio. With V-Rally 2, if you want to compare how severely the music is clipped, you can use audio track 3 to do so, but put the music volume to maximum as that causes extremely heavy clipping. Any discrepancy in clipping between the PSIO and the disc will be visible in same way as it's visible in RockMan 6 Complete Works.