@Christoph-Hart
Pasting this snippet on 1.5 and any 2.x version will reveal the difference.
I see most happened on (old) Polyphonic Filter and Harmonic Filter.
HiseSnippet 1720.3oc6Zs7aaTDFeW6LzVnIszFUdJjuapksyilbJ1wOhihchSVmzjBRsS1cb7HVOi69vstbkJg3FGqDBwUNxIfSDNhPBIDG3ZQHgPBgT9O.lY201yZu4UaRiC38fk+9l4amey2278XlcJaPUQllTCI4KUoUCjj7kAJsHV0xTChIRKlURdLPInoExHhKq4a0.ZZhzjjkCu.mg7kFQx4Yu4lGpCIpntrjj1fhUQEw0wVc41H0RXc87PMTEbcgdOYpEUojLTcpMCOgAwkZ.U+.3Nnkg7tEBHI+R4zvVTCEKnExTRdj4oZsTpQe.ws+afMwaqi3DIjTXuHW14o5ZbDy+uTlZXcsxsm2lRRxfxc0Bgc0BiCJg0vc32UabUmFhzUBQ8gbnCBdIDgW7.gWh.fmj.5FwEcLPP0r0gV9QF2b30.l52RsHwBQLwVsDMWmov8UAkwVp0BFugB.uLC0oMd8L9iBxUsJR0pKXGAjeyWrV5q3yabACpcCGjLJnJVm4MdS1vZseNiQF4W+ydbFe5peym+cA4LduiryXNBjMkxWRbITFngAFYrHQC8PASUpNF7dZYu4VmfMoDpCTRWmZSrDkyq0rHKaRavj52dzG0VLkFFHnl36iidEDCpZNuRSeKXBejsRGivEWbX3BG3F9nA2.zfg6eg9E.oKjUYMGncCfoM15tNLhjizDoSaflvG.KwVKznFkfUEs2qgrLv6rCxPD1ANWRaYwRsjw1nourUYQpvVhb28cd7u60Yw94xoHhAMQ1EXVl9dccX7w+RJEaSKA2TIob6tFRGAM843kSkxrKnmQcehCV2CNhqOFE3NIi3DVXvNWxXswpqEYvFrWF3rr37fd8J.uErmKTriA77kFTTsWzEruLXCVDLU9nyg4a4FcqMuHclIIl5vw75lnJPGPIFfqIxvB0ajG71Hc+gQXUi6MnNuirPKnj75foiGy+SyUVPWs7rkaUr0TYbni2zHSzM02J+sbomZkEUhNgZxY7nY+TMJWzYcokNwhWIpOufq97U.KgZsrc8sYw44Jz21UgtLkoub31UkN4gqQ6MRKOe89pd7ld5aoO8rBzkZULezxEueto5zdknwp9fES1i5wS8Jwl.cGiPeUHvTIRFyuRbhUFROjd.k9zw+9Yd6hgOuscwm8x2BUtuSr4pfBPi57Zgy6r0PwZna2RDulDAEKDpK24gDMg8MMdpUyCUsnBUQmJkBhsqQJAUw.RLaPEKXclcKhpZoni0PFkYUg4F378.SOIewxlwRyV2jNK6u4KeG8szhEuXqhSmI1Q4gEXUwo+dx699jVCuSsfGP1.zfKv14XBTcUdJrhwVoUQ67Faou0cZxdg5oSVrU172pXKiJM4sG8QrelEyZuPSVj6chAYI5l2nKcFoLFTSypr8HuAT2ty9R+5O6uOAKLW9H5Ibcvl2juc8HmM6cKzgVfy3f9qs4rnxlo.SLceU1bm3jBQytZ1GLy.PkK2.DTQKmN0rr95qGWrlEkYykIJAWB4oHVZxamUrFkg0rLjdXMKGpmsWN3qAJS0a4dhTBYgec2rvcaKn7v9+JJRR4MP22FQTa6x+zGQ9zTqt+9+RRqZC06o3m4wMn5PidCeD4w+02eBlyJ7QLm0M.clTmVosR77l15M2u8kmbfI40VKkN5rUKTqvDuHSdEvIz9ZAcBsIhelbDsewSdxWdBcDsot1O2yQzt6Bv2suinc22e3QzN7HZO4M7COV1AfuJMOabjyMeE82.3knOBOA64Gby8v3ehWNhG3gp6Gcd.Api0dqjJXBx4xAHV8BmYjaCahhr.hfL5a6jh0Z9gi9im72XmUTsXid.mRjjD+HjpPI9+D8rJm3qbWiunUjeFJzHvl1at7r4Xfxn.srMbV866hEvJP3am649p.DjcQdjgWEfAraNT3+edygViZagI6TBxpt9grJHW1ttBymTEwPBgfzYCDPND2uxkNNm10ojn4P7OrGuFSvok8ZLQ6FEmti2NHDOTSeAg3LqRMp2MFTx8KHz8t9m7Cm5AgRH9l6osj92L.OmTh9Y4qW7oWd1zSneWMUalIEYVFRD5TtcYzBsWHUIrvUi5oy4dAqbuLSqXpxlrPemB+dyU1V2DcarlUsDcNbfw+CA1I6dcu9oSoXdCusjCi4MncaIOXKMyMa.nx3WDgn+uxXTGpZPuKKNnkAU24NW5vgoaINWE7KAJwoijPpo6Gjiq+qyB0bWUU95uaxr.AKQxisDSbrkXxisDScrkX5isD25XKwLGfD735ossn0c8oXLJmy8jKkcSi43dI8uso.ZjB