Simulating multiple pwm channels SITL

Hello all,

I am currently working on a ‘10-a-copter’ (don’t worry about it) sitl simulation. Our hardware the pixhawk 2 is limited to 8 PWM output channels. To bypass this we are wanting to utilize 2 additional AUX channels. We are wanting to test this out in the simulation before we destroy our aircraft, but I can not find the secondary output channel within the sitl simulation. How can I properly simulate our physical constraints and create a secondary output channel within a simulation?

Thanks for any advice, I am new to utilizing auxiliary channels.