
Play a note on your keyboard and you should hear the Polysynth play. To use your own external midi keyboard, click on the rightmost of the three icons at the top right of the Sequencer window, the one that looks like a bulleted text list. Click on the virtual keyboard keys - you should hear the notes play. To use the Virtual Keyboard, click on its icon - the first in the group at the top right of the Sequencer window. Now decide whether you want to use Audition's Virtual Keyboard or an external midi keyboard. Click on the vertical piano keyboard display just beside the piano roll grid. In the next two boxes, select "All" (for the moment). The first is labelled "VSTi: " - click that box and choose Adobe Audition Polysynth. On the left of the Sequencer window, you'll see some drop down boxes. You can continue to enlarge the window as you wish. The first looks like a piano keyboard, the second like a piece from a jigsaw puzzle, and the third looks like a bulleted text list. You should now see a window whose tab probably reads "Sequencer: Midi Track A" - drag its right side until you see three icons at the top right hand corner. Make sure the ones you want enabled are ticked, then click "OK" You should see the three Adobe built-in VSTi instruments listed, and possibly others that are in your Steinberg VST folder, or any folder that you have previously set as containing your VST and VSTi plugins.

The first time you do that, the VSTi Plug-in Manager will appear - click on "Scan" button Double click on the inserted track, or click on the "Sequencer" button in the track's control panel

In the midi track's control panel, instead of the usual M S R buttons, you'll see M S L - the last button is for "Live Monitoring" - click it on. In the Audition menu select "Insert > Midi Track" In the "Session Properties" window, ensure that Monitoring is set to "Audition Mix" Edit > Audio Hardware Setup - make appropriate settings
