a = accum( 1 )

b = accum( a )

gen.createCallback( b )

  getMemory( ugen )
    if ugen.requestMemory !== undefined 
      ugen.requestMemory
      
    ugen.inputs.forEach( getMemory )
    
ugen {
  memory: {
    value:   { length:1, idx:null },
    control: { length:1, idx:null }
  }
}