Hi Cass - here is an option for an auto-conversion that does reasonably well. The NCH tools are all safe and reliable:

https://www.nch.com.au/switch/index.html

The end product (MP3) will only be as good as the sound engine used during the conversion process. I have always gotten the best results opening the MIDI's on my Yammie keyboard and tweaking the various instruments to my liking and then recording it from there.

Good luck and have fun!
_________________________
-------------------------------------
Randy

PA4X, SX900 (Baby Genos), Roland U-20, L1 Compact, Way 2 Many Saxes

"My computer beats me routinely at chess - but it's NO MATCH for me at kick boxing!"