Thanks for the replies. If you mod the chorus for vibrato does it still retain the chorus mode?
Depends on how you mod it. If you just pull the "vibrato" resistor, then no. If you use a simple SPST toggle switch to "lift" that resistor and put it back, then yes.
Chorus is nothing more than a vibrato signal riding on top of your dry signal. When you lift the 22k resistor in the dry signal path, you are just left with a pure vibrato signal.
You like delay, so think of it like this: When you use a delay, you hear your original or dry signal and then the repeats follow. The way a delay splits your signal into wet and dry is identical to the way a chorus does. So you could do the same thing to a delay pedal and all you would hear when you did the "vibrato" mod to your delay pedal are the repeats.
Inversely, you could do a "chorus" mod to a dedicated vibrato pedal like the VB-2 by adding a resistor to jumper between the input buffer and output buffer to add dry signal to the mix.