Welcome to the forum.
On the MIDI track, what is it's output set to? It must be set to an external sound module/keyboard or a software synthesizer. Since you are using ASIO, it shouldn't be set to Microsoft GS Wavetable Synth. If it is, there's something wrong.
The 1 input is 'stereo input 1' and so on. In the audio track's inputs, you should be able to select from Left, Right, or Stereo.