Midi settings questions?

What softsynth and is it the mpk's keys pads or both?

The pads are likely set to midi channel 10.
I'm assuming you're just using the tts piano patch?

The advice usually given to anyone with this issue is to set the midi playback buffers to 500 or 750 in edit-preferences-midi-playback and recording, I think default is 250

Three things that pop to mind - 
1 you might have a keyboard split defined in the preset you're using
2 are you running a midi cable into the audiobox?  if yes, unplug it.  
3 have you plugged the mpk into multiple usb slots?
 
shut down your computer, turn off the mpk, start your computer and log in to windows then turn on the mpk and once it's fully powered up launch platinum
 

Okay, restarted again, got playback sound back... but still no sound when playing the keyboard through the SoftSynth track.
 

Okay, not sure how it got unchecked but it's checked now I do seem to have live play output. Pardon me if I seem dubious, but I'm sure it was checked before and still had intermittent output... I'll play with it now and see how it goes. Thanks!

tindog13
Okay, not sure how it got unchecked but it's checked now I do seem to have live play output. Pardon me if I seem dubious, but I'm sure it was checked before and still had intermittent output... I'll play with it now and see how it goes. Thanks!

This can happen sometimes if you change usb ports. windows can be fun!

Well, great video ("MIDI for beginners"), but while it all seems pretty straight forward... choose this, select this, click this, choose sound, and Voilà - sound. But it doesn't cover if you... choose this, select this, click this, choose sound, and Voilà - nada. The problem I'm having now... problems... is that it is inconsistent... I have a new project going, it's not crashing anymore, but I can only hear my chosen instrument when the track is running, usually... sometimes I get sound when it's static but not reliably or permanently... no sound, hit play (or record)... then I get sound. Hit stop, no sound. Then, often notes will start sounding and I can't stop them until I stop the track (which also happens on playback sometimes). And something that I can't find is randomly triggering the "patterns" on the low end of the keyboard in the SessionDrummer3 patch. Still struggling with drums sounding simultaneously with other sounds, whether echo is on or off. Tried buffer sizes. Also, fighting latency.

As you can see, I continued to edit that last post as the manifold recurring issues came to mind. I checked the Audio Engine and it is on, but even if I turn it off it comes on again as soon as I hit play and doesn't go off when I hit stop. And the "always stream audio through FX" was checked.
 
I am trying to follow the video step by step, but there are differences that make it difficult... as a for instance, when the TTS-1 is added and the OK button is selected, in the video the TTS-1 panel comes right up on its own... that doesn't happen for me, not a big deal as I can just go double click the icon and it comes up, but took a bit to figure that out. Also, when the output is changed the pull down menu offers Cakewalk TTS-1... mine doesn't. It offers; master, metronome, preview, reverb, drums, parallel compression, toms, cymbals and percussion. As a rule, my output seems to always have to be set to "Master" to get any sound.
 
Right now, I have instruments selected... echoes on, if I open the TTS-1 panel and hit preview I can hear the sounds, but not when pressing keys on the MPK261.
 
As another, for instance... I thought I had it right... input set to MPK261 Omni, output to Master, banks and patches set to Piano 1 and I was actually playing the piano patch from the keyboard. Then it just went away, now, silence. Moving through settings, trying to get it back.

Sounds like you are using a Simple Instrument Track. I purposely used a separate MIDI and Audio track to demo the routing that is hidden by a SIT.
 
Try setting the option to have separate tracks when you first load TTS-1. That is also where you find the option to have TTS-1 interface open on loading. There's a checkbox there for it.
 
To select TTS-1 as an output you must have a MIDI track. The sequence is
 
(Keyboard or MIDI clip)----->MIDI TRACK INPUT-------->MIDI TRACK OUTPUT------>TTS 1------->AUDIO TRACK INPUT----->MASTER BUSS.
 
A Simple Instrument Track (SIT) cuts out much of the routing so you simply set an input and output straight to your master buss (or other downstream buss)
 
 

A tip that might help troubleshooting now and in the future:
 
TTS-1 has a little green button that looks like a musical note at the bottom of every channel strip. This is an Audition button that triggers internal playback an instrument-appropriate musical phrase. If you hear sound when you click one of these buttons, your audio routing is all good, and you should check that MIDI is getting sent to TTS-1.
 
On the other hand, if you see activity in the TTS-1 channel meter but don't hear anything, the output is not making it to your interface output or your monitoring system is not working. Follow the chain of I/O assignments and physical devices until you find the culprit.
 

And still dealing with latency. Is the latency slider greyed out because I'm using ASIO?

I don't know if you're familiar with the Presonus AudioboxUSB, but there is no real control panel... the only thing on it is Sample rate (which I have at 44.1khz) and ASIO buffer size (set to 2048). Anywhere else to look at latency? It's so minor, but enough to make it hard to play along with other tracks.

I have the AudioBox1818VSL, and I access its user interface screens by opening a program it installs that runs at Windows start up in the System Tray, at the bottom right corner of your desktop - where the flag and speaker icons live.
 
Hope that helps, 
 
Bob Bone
 

 your description of your input sounds fishy. 
Load the TTS-1  test it like you did. 
If you want different instruments you can load them from the mixer. I set up my own "band" and have a different instrument in each of the 16 channels. Drums are in CH 10. You can save this as a pre set for future use.  
Now insert a blank midi track
Set it's input to the keyboard controller Omni. 
Set the tracks output to the TTS-1. 
By setting a channel I get the different instruments. 
Done deal. Record away. Note that input echo has to be highlighted for the midi track. You won't hear anything if it's off. 
 
If this doesn't work then you have an issue with your midi cable or the controllers midi output. 
Other things to try before you jump out the window :) 
Maybe you need to re install the drivers for your audio interface  Go to the web site check the version you have is up to date and re install it. 
There is also a very hi probability you have a bum midi cable. Swap it out. 
Have you run Latency Mon? background processes can cause weirdness on a PC. 
http://www.resplendence.com/latencymon