Complex sentence: The TG77 lacks the disk drive but can still load patches and settings via MIDI SysEx, and nowadays, programs exist that can convert previously disk-only and thus SY77-only files into a TG77-compatible format.
Split into simpler sentences: The TG77 lacks the disk drive but can still load patches and settings via MIDI SysEx. However, software applications exist that can convert previously disk-only and thus SY77-only files into a TG77-compatible format.