That patchset is shipped with Duke Nukem 3D and is not meant to be used for midiplayer. You could always experiment, though...
Well, i tried, i moved the patches to /.rockbox/patchset and replaced "/.rockbox/timidity/instruments/" with "/.rockbox/patchset/" for every instrument, it didnt work for me, the cfg i tried named as "timidity.cfg" inside the patchset folder, didnt work
Renamed to "patchset.cfg" then it said failed to open "I've.pat"
EDIT: Ok after some modification of the file i found out its complicated to use that one, will wait for a reply, i just want something to listen to my at least 1000 midis