I just purchased a sequencer (keyboard) which I'm trying to connect to my Tascam DP-02. The sequencer has the following inputs/outputs: CV outputs, Sustain, Sync and midi. I connected the midi to the Tascam but what else needs to be connected in order to hear the sequencer. Do I plug to Tascam using the: Return, Send or Stereo Mix. I'm confused. I don't hear anything. Please help.