Can't hear keyboard playing with VST sounds during playback

Hi! When I start playback the project in Reaper I can't play any Vst sound with Midi keyboard. That is Midi signal from Midi keyboard passes to Reaper I can see it on the track's Input but there is no audio signal. We can only hear midi clips (items) on tracks. The problem is only with Reaper. I used to use other Daw's and there were not such a problem. My audio card is M-Aidio Delta, my settings : (track) Input\Midi\All Midi Inputs\All Channels Driver is ASIO Thanks for answers !

have you got the track record-armed with monitoring on? are the keyboard & the instrument set to the same MIDI channel?

Was this working previously.. and stopped (for unknown reason).

Right click on the arm button for that track and ensure you aren't selected on: Monitor Input (Tape Auto Style) That will prevent hearing anything during playback. If you pick "Monitor Input" instead, you can hear in stopped, playing or recording mode.