[Elecraft] KX3 tune ptt inhibit

[glen worstell]

I am using my KX3 with an external amplifier. The ACC2 output of the KX3 
keys the amplifier PTT when I push the mike PTT, as it should.

I'd like to inhibit the KX3 ACC2 PTT output when I put the KX3 in tune 
mode (ie, I want the amplifier to stay off while tuning), but can't 
figure out how to do this. The manual is not clear (to me) on this point.

Any ideas?

glen, KG0T