separated sounds all under one folder/file on DLS Device

Finally, someone named TheCheapo1 posted an updated at the end of May 2015 about installing Soundfont in Garageband 10. Thanks to him.

Despite of this great news and my following his instructions, my result was different. I did place separated individual Soundfont sounds and an Aria Player sound under Library/Audio/Sounds/Bank in their very basic form (sound font's extension as "sf2," whereas Aria Player's "cst"). See the screenshot:

Then, I went to Garageband's Inspector/Plug-ins/Instruments/AU Instruments/Apple/DLS Device/Stereo:

The DLS Device popped up. It looked like a success, for I saw GOP and Soundfont listed in drop-down menu:

But, you see! Instead of individual sound font with an extension "sf2," all of the 3 sounds I installed all became one folder. I couldn't go further to unfold the folder.

Same as the Garrison Personal Orchestra, Aria Player instrument sounds:

See, the GPO Bassoons seems to have a sub-menu to choose from, but there is no way I can click on it to choose a sound.