momentary input to switch outputs

Hi , I'm trying to figure out a way to switch between four outputs by just having a momentary input. I have a siren with four tones, each tone has it's own input wire which requires a continuous -'ve input,I have a relay connected to a remote switch to "arm" or energise it .I'm attempting to have a momentary input from the vehicle horn activate a relay to start the siren off, rather than stick with the one tone if I can press the horn again and change the tone and be able to switch between the fourvtones /inputs. I hope I've explained myself reasonably clearly

See momentary switch and two output or head and park lights on with momentary sw or need to build vss signal divider or headlight switch.
I didn't post any diagrams in those but there should be several in webland and my rants will describe their operation and requirements etc.

You'll probably have to debounce the grounding horn switch and maybe invert its signal (the 4017 is positive edge triggered but that may not matter) and ensure diode protection if relays or coils are connected to the switch.