I don't believe Milwaukie or Happy Valley Clackamas Fire Dist #1 use 2-tone for tap out any longer. Voice on VHF and 800 and pagers.
I'm guessing with the new system it will also be via radios, like Portland.
Only a guess, but I'm with all the rural space and not seeing any additions I'd think they'd have to.
Regarding the use of 2-tone, in the past few hours I've heard Canby and Colton still being tapped out with them.