Hello,
The exclusive class is explained at this page:
www.polyphone-soundfonts.com/documentati...ent-editor#doc_table
You can also read:
"0" indicates a sound reproduced with no loop, "1" indicates a sound which loops continuously, "3" indicates a sound which loops for the duration of key depression and then proceeds to play the remainder of the sample.
Note: the sf2 format had no plans for a special playback mode which triggers a sample when a key is released. One way to achieve this behavior is to double each sample with a sample containing a short silent loop followed by the sound to emit on the release. The added sample will be read with the playback parameter "3".
If it's not explained clearly feel free to ask question. The samples that needs to be played alone must have the same number of exclusive class. The value is not important, you can use 1, 38 or 99...
Regards,
Davy
