[LAU] Software or performance?

For those who don't know, for some time I've made available all the
voice patches I've created for ZynAddSubFX.

However, for the first time I've been asked what license they are
under, which presents a curious problem.

Would these be best regarded as 'software'? - in which case I'd go for
GPL2 or later, or are they more like a 'performance'? - where I would
then go for creative commons BY-SA

I'd be interested in peoples opinions.

-- 
Will J Godfrey
http://www.musically.me.uk
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