The Replay1 Daughterboard has yes a MIDI Interface to both transmit and receive MIDI data.
A MIDI interface or Breakout Board option can be purchased from hobbytronics. On the Replay1, this is connected via 4 pin headers at the front of the Daughterboard.
The MIDI Breakout Board gives you access to the MIDI communication protocol, so you can control synthesizers, sequencers, and other musical devices. See this link for more information.