External mikrophone preamp

Hello out there,
are there any recomondations for an external microphone preamp for a LS9?

Best regards

What do you need them for?

I use YAMAHA AD824 with my LS9 - but because the LS9 doesn’t have a Headamp-Remote-DSUB-Port I control it from its front panel only and the settings cannot be stored/recalled within the console…