Since 1986 (I was 13)... I have arranged my own song to sing or play trumpet to... or to play a melody overtop of.
I did a track for Somewhere Over the Rainbow for a singing competition my wife competed in. I had a PSR-S900 but chose to sequence my own “arrangment” on the Yamaha Motif XF. One of the judges knew me as a local musician. He came up to me after her performance and said... where did you get that arrangement? Is there a new Broadway version of the Wizard of Oz coming out soon? I said... no new production, it was just me and 4-5 hours of arranging time! Well, she won the competition because of her voice... but we were both proud of the arrangement!!
https://youtu.be/RRdYGfQ1DMII now use an arranger because I can launch WAV or MP3 files from old keyboards or computer mix downs. I have high quality sounds on an arranger. I also have everything in front of me when performing as a solo or a duo. Volume control of the arrangement and the sound I use on top of the track.
Genos would give me more arranging tools... newer FX and drum sounds to create arrangements to use when I gig.
Merry Christmas to all!