Rules for Tools/measuretotime()
long measuretotime(struct Clip *clip, long measure)
`struct Clip *clip'
Clip to compute.
`measuretotime' translates from a measure number into raw clock
ticks. Because different Tracks can have different time
signatures, the conversion is dependent on a specific time
signature, as defined by `clip' (each Track has a Clip). If you'd
rather use the master time signature, set the clip pointer to 0.