I remember many years ago letting someone use some of my instruments from DavePack in a GPL project, with the understanding that they would be re-licensed as GPL. Please consider these as GPL
I can forward you the email if you PM Me with your address.
EDIT: I just updated the project page to reflect the GPL 2.0 License. I can transfer the project over to thorsten, the only files I changed in the project were those to attach the tail cone I made. I havent looked at this since 2015, and I did forget to update the license as per Dave Culps email. Sorry for the confusion.