My answers to day 3:
Track 1 - Trumpet, electric piano? piano, bass (the trumpet and electric piano sounded very similar in pitch)
Track 2 - high, low, low, high, and I knew the notes were A and E! Metronome - high low low low.
Track 3 - Low, mid, high, low, high, low, mid, high, low. Same as above with metronome.
Track 4 - low, low, low, mid, mid, high, low low.