Code snippet from a blog post about preset building

presets-and-cue-building-099-deck-logic

# me - this DAT
# 
# channel - the Channel object which has changed
# sampleIndex - the index of the changed sample
# val - the numeric value of the changed sample
# prev - the previous sample value
# 
# Make sure the corresponding toggle is enabled in the CHOP Execute DAT.

attr       = op( 'constant_attr' )
deck       = op( 'null_deck' )[ 'trans' ]

deckA      = op( 'moviefilein_a' )
levelA     = op( 'level_a' )
deckB      = op( 'moviefilein_b' )
levelB     = op( 'level_b' )

cues       = op( 'null_cues' )
path       = app.samplesFolder + '/Map/{file}'

def onOffToOn(channel, sampleIndex, val, prev): 
    return

def whileOn(channel, sampleIndex, val, prev): 
    return

def onOnToOff(channel, sampleIndex, val, prev):
    return

def whileOff(channel, sampleIndex, val, prev): 
    return

def onValueChange(channel, sampleIndex, val, prev): 
    
    # we're in deckB, change A 
    if deck > 0.5: 
        deckA.par.file         = path.format( file = cues[ int( val ), 'movie_file' ] ) 
        levelA.par.blacklevel  = cues[ int( val ), 'blk_lvl' ] 
        levelA.par.invert      = cues[ int( val ), 'invert' ] 
        attr.par.value0        = float( 1 / cues[ int( val ), 'trans_time' ] ) * - 1

    else: 
        deckB.par.file         = path.format( file = cues[ int( val ), 'movie_file' ] )
        levelB.par.blacklevel  = cues[ int( val ), 'blk_lvl' ] 
        levelB.par.invert      = cues[ int( val ), 'invert' ] 
        attr.par.value0        = 1 / cues[ int( val ), 'trans_time' ]
    
    return