nostr:npub1kdgd9099pn4mnytcnh7fushn0l0dy045ccf2xks9lq8hkenazd2sktc5sf Probably not helpful, but here’s like ALL the sysex files, which probably includes your bell. Also, Arturia has a faithful DX7 plug-in, which you might find in one of their plug-in collections front torrent sites.

https://yamahablackboxes.com/collection/yamaha-dx7-synthesizer/patches/