Product Detail Interprets your MIDI keyboard playing to choose the correct harmony parts Separate Double effect using overdub algorithm Tone switch engages adaptive Live Engineer Effects 6 reverb/delay combinations with selectable alternates and 10 presets, each with A/B selection Selectable harmony voicing including octaves and the unique Bass setting . The "TC-Helicon VoiceTone Harmony-M Vocal Effects Processors" is best product for you. We recommended TC-Helicon VoiceTone Harmony-M Vocal Effects Processors