Empty

Flag which controls initialization condition:

0 Initialize always

1 Initialize only if set is empty (all elements drawn)

 Example for initializing sets

TONE Low     I 400
TONE Medium I 800
TONE High    I 1200
TONE RndTone I 0          ; Tone definition with dummy content

SET Pitches T
Low Medium High

TRIAL Melody
DE Pitches RndTone          ;Draw random element and assign it to RndTone
ST RndTone 300          ;Start Tone
DE Pitches RndTone          ;Draw next random element and assign it to RndTone
ST RndTone 300          ;Start Tone
IS Pitches          ;Initialize Set