Mike:

You're working too hard to miss my point. I'm not advocating the Tyros' little add-on speakers anymore than internal speakers - I'm advocating using a real keyboard amp. If you have a serious on-stage keyboard monitor, such as a Motion Sound KP-200s as I use, then you just turn up or down the volume or adjust the eq of your keyboard amp however you like it and let the sound man do what he will with the main signal, which is taken direct from the keyboard amp's lo-z stereo outputs, not from the keyboard. In my case, the KP-200s can also take a vocal monitor feed from the main mixer without passing that signal back through the direct outputs, so it can double as a vocal monitor. There is nowhere in this instance where any existing (or imaginary) internal keyboard speaker system would serve any purpose, and being "lost in the mix" isn't even a question. I've recently done some band gigs with this setup - no problem hearing myself clearly or being heard. As I like to say, if you gotta go then go-rilla!