Hello
I am also an user of MyOrgan,
great software !
ABout Hauptwerk, version 2 and later : sample sets are 32 bits and seems to be encrypted, so it is impossible to recover any free sounds from it to use with MyOrgan.
Editing MyOrgan is very easy, especially if you understand English very well, ther are very good documentation about ODF on Krumhorn site.
Personnaly, I have now, about 60 samples sets. Some of them come from free sample sets. Others have been designed by myself from the arpegio demo of Wikipedia. I have also extended some samples set to the bass or to the hi notes so as to have at least 48 keys in each stop, I have balanced the volume, cut the reverb, deleted noises and so on. It took me several monthes.
Now all my samples sets are in the same folder "PIPES".
So they can be shared between all my ODF. The are all numbered and renamed : 000 to 099 for pedal, 100 to 199 for Great...200-299 for swell.
some exemples :
110_Bourdon 16 120_Bourdon 8 120_Gedackt 8
121_Flute cheminee 8 122_Principal 8 123_Montre 8
125_Salicional 8 128_Trompette 8 131_Flute 4
131_Koppelfloete 4 131_Rohrfloete 4 132_Octave 4
138_Clairon 4 141_Flute 2 142_Doublette 2
142_Principal 2 160_Quinte 113 160_Quinte 223
170_Tierce 135 180_Mixture II 181_Mixture IV
181_Fourniture 190_Cornet V
I have also written a software for PC to write quickly and easily new ODF (max 3 manuals). This software could be freeware, but it only works with samples sets organized and numbered lik mine. There is no usuer manual nor help file.
It is not finalised (no divisionals or generals), but it runs very well.
So I have got now many very beatifull organs for no money but a lot of sweat.
If I can help you, tell me.