How might I create a switch that activates/deactivates velocity sensitivity?

I'm trying to make a switch that turns on/off velocity's influence on the volume of notes played within a group or groups. With the toggle off, I want the volume of notes played to be 100%. I have added a 'velocity' mod to the Amplifier and set it to control 'volume'. I named the mod "VELOCITY_TO_VOLUME" Here's what I hoped would work, but didn't...

on ui_control ($velocity_bypass_switch)
set_engine_par ($ENGINE_PAR_INTMOD_BYPASS,$velocity_bypass_switch,1,find_mod(1,"VELOCITY_TO_VOLUME"),-1)
end on

I then tried $ENGINE_PAR_MOD_TARGET_INTENSITY instead, and it works for a single toggle, but this is obviously intended for a slider

on ui_control ($velocity_bypass_switch)
set_engine_par ($ENGINE_PAR_MOD_TARGET_INTENSITY,$velocity_bypass_switch,1,find_mod(1,"VELOCITY_TO_VOLUME"),-1)
end on

Any help in the matter would be appreciated! Thanks!

 

Only internal modulators have bypass functionality. External modulators like velocity, pitch bend etc can only be bypassed by setting their amount to 0%. So, you would do $vel_amount * $vel_bypass for $ENGINE_PAR_MOD_TARGET_INTENSITY.