Mainstage: 3.5.1

As a minor update to the larger milestone, it inherited major features introduced shortly before it, such as:

: Integration of the Sampler, Quick Sampler, Drum Synth, and Remix FX plug-ins. MainStage 3.5.1

: Resolved instances where the application would quit unexpectedly when opening certain concerts or when samples were missing. As a minor update to the larger milestone,