Deltaflow®-VL is an emulator of the control stack for quantum computers. By virtualising the full digital stack, designers of quantum hardware can develop control software in a fast and efficient way away from the lab. Deltaflow®-VL lets developers understand and fix bugs long before they cause costly down time in the lab. The emulator provides a tool chain that is much easier to handle than conventional real-time logic. Writing gateware and defining the flow of data between hardware modules becomes a breeze. As an educational tool, Deltaflow®-VL gives researchers the chance to get acquainted with writing code for FPGAs and testing it rigorously and continuously.