Thank you both for the quick responses - it's nice to see that this is an active forum and I appreciate the assistance. Scott is correct, this turns out to be a case of RTFM, rather than read the received midi data and try to spit it back. Jokeyman, I might have some good news for you. Here's what I've discovered: - I was previously triggering a program change manually on the keyboard and collecting the received midi data in an app on the iPad. What I saw was MSB and LSB bank changes, a program change, and a couple other things that I wasn't sure what they were (I'm a MIDI beginner). But all the params made sense in the messages I recognized. - So what I was trying to do was send all of that data back to the Privia via an iPad app in order to trigger the very same program change without having to press the buttons on the keyboard. Wasn't working. - Per Scott's message, I looked more closely at the midi spec and immediately thought that maybe there's just too much "stuff" being sent back to the Privia and if I kept it simple, maybe it would work. - So I stripped the raw MIDI I was sending down to just the MSB and LSB bank changes and then the program change. It didn't work. Then I tried pulling out the LSB message and just sending the MSB bank change and the program change. Voila - it worked! - But there are a couple other caveats: 1) You have to also shut off Local Control in the MIDI settings on the keyboard, or it plays both the tone that was sent via MIDI *and* the tone that's set on the keyboard. 2) While this all works, it doesn't change what's visually displayed on the keyboard, via the LCD screen and red LEDs. So you have to rely on your outboard MIDI app to tell you what tone(s) are actually selected. I was hoping the MIDI messages would behave *exactly* like pressing the buttons on the keyboard, but they don't. They set the right sound, but they don't visually change what's displayed on the keyboard itself. But so far, so good - I'm 85% of the way to my goal of being able to play the keyboard directly, use its onboard sounds, but use a pretty cool iPad setlist manager app to control which tones are being used, based on what song we're playing. I think with a bit more fiddling, I should be able to figure out how to tell it via MIDI to split the keyboard into two parts and set a different tone for the left hand. Worst case if I can't, I can just hit the Split button on the keyboard, but I like the idea of doing everything through the iPad app - it'll be much easier to see under gig lighting conditions. Jokeyman, let me know if this approach works for you on the PX-350 with whatever outboard controller you're using.
