[Icom] IC-756 pro2 cw question

[icom@mailman.qth.net]

Hi friends,
I have a question regarding zero beating a cw signal on the Pro2.
My FT-1000D and Omni 6 have a button when depressed produces a reference tone 
that you zero beat with the signal on the air, I find it an easy way to get 
right on the frequency of the other station.
Being that the Pro2 does not have such a reference tone, can someone explain 
how I can zero beat the signal of interest? Am I missing something here?
Thanks for the bandwidth de Jim  K2ZF