Here is a list with the most important features:
 

• Available on iPad and iPhone

• Manage songs with great search and sort options

• View lyrics or sheet music (PDF, TXT, PNG, JPG, JPEG, TIF, TIFF, GIF, LRC, ChordPro)

• Play playbacks (MP3, WAV, AIFF, M4A)

• Multitrack audio player (5 stereo audio files) with separate audio outputs

• Multichannel audio routing to separate audio outputs (with external hardware)

• Mixer with 10 bands equalizer and separate volume for the 5 audio files, global and per song

• Play MIDI files (with external sound generation)

• Play karaoke videos (MOV, MP4, MPV, 3GP, M4V)

• Loop function for audio, midi and video files

• Use in portrait or landscape mode (landscape mode only on iPad)

• Insert notes/chords/symbols/sheet music/images/shapes

• Highlight/underline/strike out text passages

• Hand write/paint in the document

• Insert custom, configurable buttons into the document

• Full page turns or smooth scrolling

• Auto page turns or scrolling

• Record song positions with your finger

• Import and display lyrics of Midi/MP3 files

• Control using foot pedal (see here for supported pedals)

• Wirelessly connect SongBooks for a synchronous song selection

• Select the next song while a song is playing

• Create playlists

• Music log for billing with GEMA/SUIZA/…

• Take a photo of lyrics/sheet music and convert them into PDF files

• Night mode with inverted colors

• Optical and/or acoustic metronome

• Connect an external monitor with a possible rotation of 90/180/270 degrees

• Separate into multiple books, e.g. one book per volume

Exceptional MIDI options:
 

• Access the according registration via keyboard when opening the song

• Open a song on the iPad via MIDI remote control

• Send individually configurable MIDI commands when opening/starting/stopping the song

• Insert any buttons for MIDI commands into the lyrics/sheet music

• Remotely browse via MIDI

• Play MIDI files via MIDI-Out on the keyboard/MIDI player/expander

• Integrated MIDI monitor