[chuck] time signature durations

Hello, Is there built-in support for time signatures, or should I just be doing something like 400::ms => dur q; 4::q => dur w; 2::w => now; while (true) { q => now; ... } It would be nice to be able to write a file or shred using time-signature based durations and be able to change the values of those durations from somewhere else, effectively changing the BPM of everything you may have running simultaneously. michael