Hello Raimund,
Thanks very much for the interest in upgrading.
Yes -- all three of those sample sets are available for v7, and can be downloaded in v7 format from their makers, with no sample set upgrade costs, except that a $30 sample set licence migration fee applies in total for migrating all of your v4 sample sets from the v4 USB Key to the iLok system (which is used by v7 for licensing sample sets).
Hence the total cost to you would be $299 for the v4 Advanced Edition to v7 Advanced Edition upgrade (
https://www.hauptwerk.com/upgrade-advan ... perpetual/ ), and then $30 to migrate your sample set licences.
The v7 versions of MDA sample sets can be downloaded here:
viewtopic.php?f=10&t=17988 . For the download links for the v7 Vollenhove, you would need to contact OrganArt Media.
Best regards, Martin.
Hauptwerk software designer/developer, Milan Digital Audio.