Well this was a good learning experience at least.
I barely know what I'm doing, but I was able to use IDA 5.0 Freeware to find out where the MIDI Device was being set.
I still couldn't figure out how to actually edit
sshock.exe with IDA (I'm sure it must
be possible, but perhaps not in the freeware version?) so I ended up editing the file with HxD Hex Editor.
1. Open up DOSBox and run "mixer /listmidi" to get a list of your MIDI devices.
2. Open up sshock.exe in HxD and search for "6A 00 6A 00 6A 00 6A 00" The offset for this should be 000019C0
3. Set the last two digits to match the ID of your MIDI device. In my case it was #5 so it now reads "6A 00 6A 00 6A 00 6A 05
(P.S. I would have included links to IDA and HxD, but I don't think I have enough posts on the forum yet to include links)
Any way to change midi device in exe file after latest update? If file name is changed to sekhmet_x64.exe