Jack timebase synchronization
From Arnout Engelen
jack allows timebase synchronization: one process is assigned 'timebase master', and 'timebase clients' are asked to follow the timebase masters' information.
this gets complicated in the presence of tempo and time signature changes. Right now the timebase master must announce the tempo in BPM, quantized to the block size. To do this more 'properly', it'd seem applications should share the tempo and time signature maps. Sharing time signature maps might be tricky though, because that would mean all applications should agree on a single time signature at each point in the song, and that's not always desirable.
