emusonacid! legacy

I don't know if anyone's come across this before but I have found that if I route External ADC1 to Bus 6 on the main multimode page, then it appears on External ADC2. If I set the routing to mixer, and set one of the mixer routings to Bus6, it all works ok!

Now I think about it I have a vague recollection of something similar being reported on the old emusaic list...