fix mistyped get_cb bugs.
fix mistyped get_cb bugs.

OpenMusicKontrollers/synthpod,OpenMusicKontrollers/eteroj.lv2,OpenMusicKontrollers/eteroj.lv2,OpenMusicKontrollers/chimaera.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/chimaera.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/orbit.lv2,OpenMusicKontrollers/sherlock.lv2,OpenMusicKontrollers/synthpod,OpenMusicKontrollers/orbit.lv2,OpenMusicKontrollers/espressivo.lv2,OpenMusicKontrollers/sherlock.lv2