I am aware of the dbwbp synth ROM archive having a BOATload of dumped synthesizer ROMs (obviously of both the PCM/Operating System related ROMs), however there just doesn't seem to be any that pertain to the PCM waveROM that's found in the Yamaha SY99. The reason I ask, or at the very least am willing to open up a search of the ROM dump is because of the now upcoming SY99 emulation by sheaf called SWAY (KVR has a forum started by sheaf going on about the development status of SWAY), and it can make use of those very ROMs.

The closest things I've found to viable ROMs/audio samples are an entire track of the SY99 ROM streamed on SoundCloud, and on dbwpb: a waveROM for what seems to only be the rhythm section for the SY77 or something.

Any and all help is greatly appreciated. Though, hopefully once the sister site catches word of SWAY, once it's released, whichever willing distribution team/individual will be able to pack in ROM dumps without needing to go on an Internet safari to look for them!