Soundtracker and Protracker tempo

Tracker 4.44

## 8.3: Protracker tempo

The player uses two tempo values: fundamental tempo (t1) and fine tempo (t2, invention of protracker).

By default, t1=6 and t2=125. A tick occurs with a frequency of 50*t2/125 Hz (some specific tracker tunes have been developped on NTSC machines with a buggy tracker and the frequency is 60*t2/125 Hz in that case).

The basic play-sequence takes t1 ticks: 0st tick: read new series of event and applies them. Do not apply on-going effects (violent contrast with MED). 1st to t1-1th ticks: apply effects. then start again.