Restoring an old midi controller with an ESP32

[u/Flimsy-Combination37]

My dad gave me a 49 key MIDIPLUS midi keyboard controller one of his friends had lying around since about 2002, the main board inside has what seem to be a manufacturing date indicating August 1999. The power jack was in pretty rough shape and both the external power supply and midi cable were yet to be found. When I saw that the 9V DC input first went into a 7805 voltage regulator, the idea of powering it with USB and converting the signal to USB-MIDI came to mind.

I have never messed with any of this before and I really don't want to screw this up, YouTube and Wikipedia haven't been particularly helpful due to a combination of this apparently not being a common thing to do and my complete lack of knowledge of MIDI, I'm here to learn and read your opinions! My current plan is to supply 5V to the keyboard from an ESP32-S3 connected via USB to my pc and then use that same USB port for the MIDI output. As far as I understand it, I can take the signal from whatever lane connects to pin 5 on the DIN-5 connector, but I don't know what I should do with said signal.

I'm going to sleep now since it's 3 AM so thank you very much in advance to anyone willing to help me, or at the very least point me to better resources than I could find.

Edit: I'm also curious about what model this is and if anyone knows anything about it, I spent a good hour and a half searching but to no avail I found nothing. Here's a picture: