A "Soundfont" (specifically the .sf2 format) is essentially a container for audio samples mapped across a keyboard. When the internet began archiving vintage gear, the JV-1080 was a prime target. Enthusiasts sampled the raw waveforms from the hardware cartridges and compiled them into Soundfont banks.
: These files generally contain raw PCM waveforms from the hardware but lack the complex "Patch" architecture of the original unit, which layered up to four tones with unique filters and LFOs. Sound Quality roland jv 1080 soundfont