I currently use 1manband 12.1 with a Roland Go Keys..as the controller and sound source...This runs on my PC laptop with Asio4all drivers..

No latency problems.. I also have the factory Tyros styles 1,2,3,4, and 5..Also some converted Genos styles.. G70 factory styles are also in my library..

This system works in a pinch.. and yes a dedicated arranger keyboard most times is better.. but if you have a favorite synth or piano... 1manband works well at a very reasonable price..

Can the ipad users use asio4all drivers? the latency is the ipad fault not 1manband..
You can also just use 1manband as a drum machine...latency will not be a factor..