Here's what I'm looking for... Something like an A/B box, but I want to be able to be able to send my guitar's signal out through at least 4 sends. The ability to turn the sends on/off isn't necessary since it won't be used live. Also, I would like to be able to plug more than one guitar in at a time, and possible designate which signal goes to which send. Does something like this already exist? Is this basically what a patch bay does? Thanks for any info!