PlayStation Development Network

Hello there! I'm looking to inquire about how the SQ, BD, and HD file formats work the on PS1. As well as, indeed, what they're even doing there, because up until very recently I always thought that those were formats specifically for the Sony SDK's sequenced music engine on the PS2 (you might know as CSL, or the Component Sound Library). However, according to this document (https://problemkaputt.de/psxspx-cdrom-f ... ormats.htm), it would appear that SQ/BD/HD was conceived a bit before the release of the PS2 and was used on a number of PS1 games around 1999 or so. Some of these games include Alundra 2, Wild Arms 2, The Legend of Dragoon, and Arc the Lad 3 among others (notably, the former two are both associated with the production company Contrail, who apparently shared music tools between games). Normally, I would've investigated this myself by analyzing the game files themselves, but I don't have access to those right now. My next step would've been to try the existing PSF rips, but most if not all of them are MINIPSF and are also compressed on top of that, making that difficult. Can anyone here assist, including how this PS1 version of SQ/BD/HD might differ from both SMF format 0 MIDI (which SQ is supposedly very close to) and those files' PS2 equivalents? This is all quite fascinating to me and I'd love to see if this can help me with my goals of getting homebrew sequenced music working on these older PlayStation consoles!