(this station will be used if the primary station runs out of music, or if the primary station is first play and has been listened to already)
Time index into the station that music playback should start. If the time is X, then X seconds of the video will be silent and music will commence starting at X seconds into the station. (the expectation being that the user is dropped in to the video at X seconds)
this should be a simple number within 0..1, or provide comma separated 'volume, label' pairs to create multiple volume renditions (for example "0.1,low,0.5,medium,1.0,high")
try 5.8.192.1 for a foreign test case, or 50.141.70.144 for a US test case
if not provided, one will be generated and returned for future calls
defaults to 60 * 60 = 1 hour for VOD, and 20 minutes for live streams