Have coded up a little application that mutes RR while PC Nav7 is speaking, files attached in the ZIP.
Please note that this is a hack to Nav7 and involves a change to the Nav7 executable. Use at your own risk (and back up the Nav7 exe first
).
Only tested it with RR and Nav7 but it should work with FI and it may work with other satnav apps. Will test with Nav8 as soon as I get a copy.