help please cubase pro 8 and Rme fireface 802, no sound play

i have windows 10 64 bit
rme fireface 802
and i record audio and guitar
but when i touch the key of my keybord, space, i have no sound playing in audio
with the mouse it work if i choose mouse sound play ( sorry for my english)
please help me i don t anderstand where is the problem
the audio is well record, but when i touch key space for playing no sound to hear, nothing

Hi and welcome,

How is your MIDI keyboard connected? USB or MIDI to RME?

Are you using a MIDI- or an Instrument track? What is the Input settings of the track? “All MIDI Inputs” or any dedicated MIDI In?