variable 48 to 72 volt controller ?

I'm looking for a new crystalyte 48 to 72 volt 60 controller. Does anyone know if I have to program the controller with usb if I want to use 52 volts.
I heard that some are not programable. Does anyone know were the best place to purchase one is. It doesnt seem crystalyte makes it easy to find what I'm looking for.

why did you pick 52V out of the blue? 48V is 54.6V DC for 13S lipo and 58V for 16S lifepo4.

I bought my bike with the battery. They have 52 63 78 and 90 volt nmc batteries

I have seen crystalyte contollers that have ranges of voltages but not sure if they need pre programmed for the desired voltage or not.

http://www.ebikes.ca/shop/ebike-parts/controllers.html

If you find the LVC circuit resistor you can set it for whatever voltage you want by chnging the value of the resistor. I put a variable resistor in parallel withe the one already there so I could adjust the original lvc of ~60V up to whatever I wanted it to be by simply turning the pot. If I ever want to go lower than the original LVC I could just remove the original resistor and then had an infinite voltage selection. A 500-5K ohm var would let you set lvc to whatever you want up to about 100V. On my controller a 1200 ohm value set it to 60V and an 800 ohm value set it to ~86V. The higher the resistance, the lower the LVC value.