Mixer Reverb and Chorus have no effect on sound
Steps to reproduce:
1. Play a score in MuseScore
2. View > Mixer
3. Move the Rev and Cho dials up or down
Expected behavior: The dials should affect the sound (or be removed from the user interface).
Actual behavior: The dials have no effect on sound.
Discussion: Sound effects are now controlled from View > Synthesizer > Master Effects. Were the individual instrument dials actually desirable? In previous versions of MuseScore each instrument ended up running through reverb and chorus twice (once for each instrument track and then again for the master synthesizer settings). Running the reverb twice reduces the realism (with a "room within a room" effect) and if the SoundFont samples have any reverb, it means a total of three passes through reverb. The chorus effect is specifically not wanted for solo instruments, and General MIDI already has specific program numbers for group ensemble sounds. If the per track controls are reimplemented they should be set to zero when creating a new score.
GIT commit: 2eeb3de