Yes, a voice editor for the PSS-680 Yamaha keyboard!
Requires a MIDI interface (obviously).

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  257     381  67.5% -lh5- eaef Oct 22  1992 V680_Instructions.txt.info
[generic]                60398  105480  57.3% -lh5- 1852 Oct 22  1992 voice-680
[generic]                  412    1122  36.7% -lh5- cf68 Oct 22  1992 voice-680.info
[generic]                   33      39  84.6% -lh5- a29a Aug 30  1992 Voices/FairySynth.680
[generic]                   39      39 100.0% -lh0- 8c45 Aug 30  1992 Voices/hypervoice.680
[generic]                   39      39 100.0% -lh0- 380c Aug 30  1992 Voices/Phaser.680
[generic]                   36      39  92.3% -lh5- 173c Aug 30  1992 Voices/SynthBass1.680
[generic]                   35      39  89.7% -lh5- 2010 Aug 30  1992 Voices/SynthBassFadeIn.680
[generic]                   39      39 100.0% -lh0- f6fb Aug 30  1992 Voices/ThickSynth.680
[generic]                   37      39  94.9% -lh5- 5a52 Aug 30  1992 Voices/Wow-wow.680
[generic]                 5150   12759  40.4% -lh5- 763b Oct 22  1992 V680_instructions.txt
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        11 files   66475  120015  55.4%            Oct 22  1992