fix up drag and drop to only work on sound channel
fix up drag and drop to only work on sound channel

apportable/SpriteBuilder,oxeron/SpriteBuilder,diwip/SpriteBuilder,eric-seekas/SpriteBuilder,diogocarneiro/SpriteBuilder,quicklyslow/SpriteBuilder,diogocarneiro/SpriteBuilder,rraallvv/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,spritebuilder/SpriteBuilder,spritebuilder/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,rraallvv/SpriteBuilder,RobertPeng/SpriteBuilder,eric-seekas/SpriteBuilder,oxeron/CocosBuilder,olegnaumenko/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,quicklyslow/SpriteBuilder,spritebuilder/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,diogocarneiro/SpriteBuilder,oxeron/CocosBuilder,RobertPeng/SpriteBuilder,quicklyslow/SpriteBuilder,olegnaumenko/SpriteBuilder,eric-seekas/SpriteBuilder,eric-seekas/SpriteBuilder,olegnaumenko/SpriteBuilder,diwip/SpriteBuilder,spritebuilder/SpriteBuilder,RobertPeng/SpriteBuilder,apportable/SpriteBuilder,oxeron/SpriteBuilder,olegnaumenko/SpriteBuilder,RobertPeng/SpriteBuilder,diogocarneiro/SpriteBuilder,diwip/SpriteBuilder,rraallvv/SpriteBuilder,oxeron/CocosBuilder,apportable/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,diogocarneiro/SpriteBuilder,spritebuilder/SpriteBuilder,diogocarneiro/SpriteBuilder,oxeron/SpriteBuilder,diwip/SpriteBuilder,diwip/SpriteBuilder,olegnaumenko/SpriteBuilder,DNESS/SpriteBuilder,rraallvv/SpriteBuilder,spritebuilder/SpriteBuilder,apportable/SpriteBuilder,oxeron/SpriteBuilder,ZeusbaseGameWorkshop/SpriteBuilder,DNESS/SpriteBuilder,DNESS/SpriteBuilder,oxeron/CocosBuilder,RobertPeng/SpriteBuilder,apportable/SpriteBuilder,oxeron/SpriteBuilder,DNESS/SpriteBuilder,eric-seekas/SpriteBuilder,DNESS/SpriteBuilder,rraallvv/SpriteBuilder,DNESS/SpriteBuilder,oxeron/CocosBuilder,RobertPeng/SpriteBuilder,diwip/SpriteBuilder,quicklyslow/SpriteBuilder,oxeron/SpriteBuilder,oxeron/CocosBuilder,apportable/SpriteBuilder,quicklyslow/SpriteBuilder,eric-seekas/SpriteBuilder,olegnaumenko/SpriteBuilder