Of coarse you can use the keyboard's onboard effects Just plug the mixer into the mic input on the keyboard. Turn down the volume knob on the back of the 1000 and make sure you don't overdrive the input. By the way just send the 1000 a mono signal from the mixer not a stereo signal the mic channel is mono.
Mel
Just curious on which output to use:
1. xlr mic INTO channel 1 of my Yamaha mixer (I have my audio outputs of keyboard L/R into channels 5/6 of my mixer)
2. I have my XLR outs of mixer into my QSCs
3. Now, what output do I use from the mixer to the mic input of the keyboard?
Thanks for you help