Anybody knows how to run DD2 in pSX 1.13 emulator ? Is there a way to tell it to use the cue file like mednafen does ? Simply loading track01.bin disables all music and stuff since it doesn't recognize the 19 other .bin files.

To be honest, I'm a total noob at emulation. I wanted to speedrun DD2 when I saw it on SRC, then I tried it on epsxe but I ended up having the exact same issue you encounter with pSX. Then I tried playing DD2 with the pSX emulator and it worked well. That's all I wanted to begin with. I don't even know if cue/bin files are better than img files ... So, I'm sorry I don't think I could help you even though I play it on pSX emulator. For your information, I can tell you I usually use romstation to play some old 8-bit/16-bit games. For the ps1, the romstation launcher has epsxe and pSX installed, both with the SCPH1001 bios. Maybe the pSX emulator installed with romstation is already well configured, so if you give it a try...