Option key not working

On the Power Cab, you will need the firmware version 1.65 or 1.65B. Check that here: https://ncedcc.zendesk.com/hc/en-us/articles/201414309-What-Power-Cab-Version-do-I-have

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 Ph-Pro / Powerhouse / CS02 systems must have EPROM version 2007c or newer to access all 28 functions from a cab. Check your version here:  https://ncedcc.zendesk.com/hc/en-us/articles/201873725-PH-Pro-Powerhouse-CS02-What-Version-do-I-have-

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The option key is a programmable key that can be set to do various functions

The default value for the option key is either as a brake (value=94)  or a function shift key (value=122)

to change this you need to get into cab setup mode and change the value for the option key.

Go here to setup the option key