A message is sent to all notified clients. See Server.
a non-positive to positive transition triggers a message.
a string or symbol, as a message name.
array of ugens, or valid ugen inputs.
integer id (similar to SendTrig).
Sometimes, we need to know when a message was sent. Because
SendReply can send only messages (which have no timestamp) and no bundles (which have), we can't use the
time argument of the OSCdef's function. Instead, you can send a time stamp with the data, by using the Sweep UGen.