Best I can come up with is...
- Mult the audio output of both Cruin and Chainsaw four audio signals total.
- Send those signals into four 1U VCAs
- Mult a steady 10 volts into Mutes.
- Use Mutes to open and close those four VCAs.
- Those VCAs feed one mixer ahead of Ikarie and one ahead of NG
- Use Switchblade to change the v/oct into Cruin and the trigger into NG.
With those mutes I can turn off/on Crun and chainsaw into each of Ikarie and NG.
So with a few switches, turn off Chainsaw into NG, and Crun into Ikarie, while hitting Switchblade to change the melody into Cruin and NG.
If I always want CS into Ikarie and Crun into NG, I think I can get away with two VCAs - not Four!