@Kalliopei if you just want to show the gain reduction on your UI, use a global cable with the mod output of the compressor and register an async callback on your UI script:
HiseSnippet 2207.3oc0Yzzaaibkz1icrcRrSZZSA5EhE8fRapfjchcRWTXYYKG6lHaUKsZ28T1QjCkHD4LrjCcrZwBrnm5gdnW2a4XOzCE8Vuk+Bs8X6g9SH+B5tuYFRKRIYaIEGuaT.B37l488adeLtV.yjDFxBzzWpQOehl9MQ06Q4c1oC1gpcvtZ52FUEGxIAFJPk64iCCIVZ55y9LA.8EmSS96saUF6holj9fzzZxbLIuvwyg2Gpeom635tG1hzvwK0oeToCLYzcXtrHPdlEUPyGa1E2lbHVbrYPZ6iC6no+yPqisZs4SJRZQdp0lX75a9302rXKyMe5FjMd7SWG+nBaV3I3mTPSe9JVNbVPcNlSBAhVlY0qdG1qnJFzzIzokKQrnnVcfyJvZ6zww0pVhwITSSGUquoZVko5dnpNVNmAuuIaU4FF8wHsQSelKRjJNAhzLoDo4ThzcP0MCb7482QHOKiNfBdPaL3aRKJpypMyeUGsCCNAkm2C2krW.r3LLxsQgBOz.9uG7wKsD3eB4FmfCLB7L9UFUnscnj7sI7m4xZgcOlEwcnsqhofWKHGfQeDZCVmWZhAUCPLvSfzNhU49H4NADqHStCi9QB9z+v4CHscDwe6fccaAwC4rinxCl6DraD4AK86WZQP5CYvY8Cbn7b8kpcIlNsHtg6wBDwp6gMACeth4KX7KLTXCL6Kenw1g8nlGx3N1NlXAsevGmvECFE1fbDMmjSK8kKYL3V11ibOgIMf45JLDiXaQrevEgXNZjWKRvCM5qmhCB95rAPyOdAPlJObpCxnGPc3G4ShWuGy0RDXH9d3vMs3PD3qO4fcwbLDApGCCNmOIf6HDG8cIm.24UwiKh1kD1ky70zF99ysPaG3SZ21AyiCTyBIyslYuht0zWMz+AwFZ3nbo.c63aOki3bFUywR.RIEwfjthz42zFCZbKzwjPBOKIP5WH50ccrHARzWAcXjWcNwOF1YDXtwj.KiDXKkgIPARQfUkDndWmgDA8wzD.TfEveNo2jaHypH9Dh0yorV8EgkGExqFi7NLuVrxrSkneWTcxuMh.UnNC73oHoDgagNxjiOgbLl1lL49xEQ06DYa6RltHokQUnhjhMbHmmnOmB46lg20f7lRBbOvD34zfQIo13LJ8MvOKwMa8eBp3F4G8uIfWMItLSGduwhW1+7xamO+Se9t4yudTM05wlW2E8BBsMuy3wotBN07WCb5yX0TqGyPn6ffp7TJwsNwkHJlbIQPijH2GcTD2OheEPp6fpVqBjSLHgX8IxLiMQVQPjJTqgHwpiYX47n8gRGiHjd3FTfViXVQth76o6WRTcNdCnFXlL+hFQngPTT5NMmflnJbwkCFSQ7NnZNbyNiVFmYDxnn+r2Cx3YkNqXaCQM8Ev4P68YSaelWL600G1FsTbP.vSUClpkFCHCwMXp+GQ86uwOf3iCHMX0bw8xEh87cgrobxCMZAYK5V242QFtoHekDTVbhblp3zvoo2o4upZi3rVc4ANmBWVD0ng4VfZKwRWxcv30ERJSTmPsJjjWJdyhI25EaVLYyTcbcHg+JVPWo2H9aM8anL8gRi7KsOUaaWW1qfq19NwwnfKPBqFysmeGF0wT.RchDAcaOVDviXose.d4DuQhfCCe0.63Jh2qGEBcMZcDsNPG4De5y1jDDJ44BnB4g+Aw+GxrfslW01cuZXdGwEIQinPTKIHu4YQuo0hzAPpI+RuqflIiHhhST54IrRhAD0mMUqnpHWwJ3d4LB1bSzAgME6Zhc0ZpRWApsflxAphEXwQmGjSOesLx9JHqdTrmiYXd4lCKowXcIB4boExTl7F3.Xnkv3FqoDSkSTJVGHaFssbLK0jQZ0vA.SgQiD6s.RoOBNA2nNMoC8ccB8gKZkgtNHpayYfHLLTKxoIwbUfqMVvT.RzShCOiQpAgSVAoAp5PalMq+m+lp3SaNXk.Y+ixXIIrW+0e8+Xq5cIuRYdig9l1+seXIkapQm.RXmNhpJMHmxavjTDLJm.lMAmECVHmsCDt1pGGndTqmEvh7kKRIAe0uw1tva1kXiib4MGtF0EpNf6YP0oDqzXoNewi9y+msDpyMPay4hVRFspLOR9LHWpd7WlS60GWZz5wAktFziEg4XbI3Px6nhn4Ya+KmVE4saMb7UowSQd8+9++ujJxBniE22NG0XYzm.2HrgLTViQvUWa6e74nKucqI2o.Jy.5hjPCoKRnwkdgVdUYRuBzG0uy8xRpDjCjLJShxeDJPUdLelyLb9xAHR57lKN+9+8+z2LwI3Sk3LV7WEk8AlFYF2r43zS42Vd77afOZH+Fj26b8aI4quh7YucqyKFb6HNyC51Q1nZF0TqLi00CKaq3c9MctuZykQeJLcr7IjkE1umbsMKvy3YDnl+POry682PVMudi.LMzmERJlw8DOLbXFnCfwZiDi0xdegGQyRZEnLmRXI1CrDoN2MJk.bsz.qgoYHFrNCkpJZ4LY4+aK0iBTm.Zt0QglfgAOPDWsH2Pxm5Xw6TLMh8AuVZv6iCr.WnYloYF3A3la75bN6fcoN+HlyX92WOw9bi2nOWx6e98+gYyLo1JJYbAz16ua8iiEM42FUf7Ltvs6LhVUFkkLiPe29wDX9l1sIYyeMJsP0iyNQAmLPoDSbugfF2PzPPdAAjrzfkOrfZ8W8Os+okjjK4.+2E9CkfQQ3YRg74uIoKkTIEpXxpJKcMUV8I3OMzEEYbq39.Mjorl3vhq0n3amHqJOx2uE1ahjgEeHXWWAEGv9Agg81Ic7+gfo8BehtYGqmn6JWdm9mq6ZtlEzQgw6RMqqUw89HnKm0Ljtaiu682WGOE30AO7vlArWZpdAUQgsaHg.5MUNr1hnph0FEG9k98flwdooYVRMDhqMsHt9zh3ilVDe7zh3FSKhaNsH9jKGQQuxwyAJG.VqZsJpW3SWM6f7Ji12BT.R7RI