What do you have plugged into the MIDI ports on your US-122?
If you don't have a synthesizer, keyboard, or tone generator hooked to the MIDI port, then that's why nothing is happening.
MIDI is only information like "Play this note, then play this note". You then have to send that series of instructions to something that makes sound. This can be some MIDI device, or it can be a hardware or software synth provided by your soundcard, or it can be a softsynth.
It sounds like you don't have any MIDI instruments, and it also sounds like your soundcard has no synthesizer. So, if you want to play the first tutuorial, you need to insert a softsynth like the Edirol VSC. Go to Insert->DXi Synth and insert the Edirol. When the dialog box comes up, make sure you have "First Audio Output" selected in the "Create Tracks" section. You'll see HS insert the Edirol VSC, create a new Audio track, and hook its input to the Edirol VSC.
Now set the output of all your MIDI tracks to the Edirol VSC and try playing the project.
The tutorial on softsynths may help. I believe it was Number 9...
< Message edited by sinc -- 2/1/2005 5:54:46 AM >