I haven't used EchoBoy with MainStage for years but I'm pretty sure that I used to configure it to sync tempo with the host (MainStage) and had a button mapped to MS's own tap tempo function in my concert. The tapped tempo was then synced by EchoBoy. As I haven't used EchoBoy with MainStage for ages, I'm not sure if there's now the ability to directly map EB's tap tempo button to a MS button/function, but I remember that my workaround did the job.
1 reply
Soundtoys Echoboy