OSSC has no game audio output issue

[moncat2005]

I am using OSSC version 1.8 with firmware version 1.12. Last night while testing the PS1 game Sangokushi III (Japan), I discovered a bug with audio failure.

1. Use image files and CDR to burn CDs and then insert them into the console for gaming.
2. To ensure the integrity of the images and audio in my game files, I used a gold finger card to boot up the interface. In the playback function, I found the opening animation files for the logo and opening. When I clicked on them, I found that the video and audio parts were complete. When I selected to play, the entire animation's audio and video were normal.
3. Starting the CD game in normal mode, I found that whether it was in LOGO or OPENING, or even entering the game character selection interface after pressing the start button, the entire process had completely normal images, but there was no sound at all.
4. In order to eliminate the interference of the Golden Finger card, I unplugged it and restarted the game, but the whole process still had no sound.
5. I tried adjusting the relevant parameters with the remote control until I adjusted one of the OSD parameters called FPGA PLL BW. After switching from low to hgih for 1 second, the game sound appeared.
6. At this point, there are partially overlapping lines in the lower half of the screen, and it is necessary to adjust the other OSD parameter ADC PLL BW to HIGH to restore the screen to normal.

What caused the problem? What is the specific meaning of the ADC PLL BW and FPGA PLL BW that I adjusted? My personal feeling is that OSSC treated the audio as muted when processing the video signal source of this game? I have never intentionally adjusted these parameters when running other PS1 games before, and the game's audio and video have always been normal.

[marqs85]

It the game perhaps using interlace (525-i displayed on front LCD) or some different timing compared to other PS1 games? That could e.g. result to slightly different refresh rate which some modern displays may be very sensitive to. It's first recommended to check if the issue reproduces on another display/TV. The PLL bandwidth options can trade off between image stability and HDMI clock/sync jitter, but if understood correct it only provided a temporary fix in your case.