i have MC6 Touch full pack on steam. i inserted SI-Drum and SI-Bass as tracks (midi source option), tested sound in plugin window (sounds great), imported midi in there, but after pressing play/record button sound dissapears (even in plugin window), CakewalkSoundCenter stops sounding that way too. asio driver is set in preferences. TTS-1 and 3rd party plugins work well anyway, but not internal cakewalk. what should i do to fix?
 
hardware: core i5 2500k, 8gb ram, audigy se

It is possible the imported MIDI files have data in the beginning of them that needs to be removed. Open the MIDI track(s) in the Event List view and remove any non-note events at the beginning of the track(s).

thanks a lot, it works now

Glad to help. Maybe add *SOLVED* to the subject line. It may help others when they go searching for solutions.