If you accidently set the V-1HD into 50Hz (PAL) and you don't have any PAL monitors. It will be difficult for you to reset the unit to factory default. Here are some steps to execute a "Blind Factory" reset:

1. Turn off the V-1HD
2. Put the T-Bar Fader in the Down position
3. Turn on the V-1HD
4. Let the V-1HD boot up (about 30 seconds)
5. Press and Hold TAP BPM button until it turns green
6. Press the TRANSFORMER  (DOWN) 50 times
7. Press the TRANSFORMER  (UP) 1 time
8. Put the T-Bar fader in the Up position
9. The Transformer  should be flashing
10. Press it to execute a Factory Reset

Hope this helps you recover the unit to 59.94Hz (NTSC)