If you are new to MPE, the acronym can feel abstract. The idea behind it is not. MPE, or MIDI Polyphonic Expression, lets every note you play carry its own expressive information, the way a violinist shapes each note differently. Boris FX's MPE guide describes it as MIDI that controls multiple parameters per note, instead of applying pitch bend or pressure to a whole channel.

Those parameters are often grouped into five gestures. Understanding them makes it much easier to choose a controller, program a patch and practice with purpose.

1. Strike

Strike is the initial force of a key or pad press, what MIDI calls velocity. It is the most familiar dimension and the one every keyboard player already controls. In MPE, strike remains per-note, which is no different from ordinary MIDI, but it becomes one of five instead of the only one.

Mapping idea: use strike for the attack character, such as the brightness of the first transient, rather than only for volume.

2. Press

Press is the pressure you apply after the initial hit, also called aftertouch. In ordinary channel aftertouch, pressing one note in a chord affects all of them. In MPE, only the note you press responds.

Mapping idea: route pressure to loudness for natural swells, or to filter cutoff or vibrato depth for a more vocal feel. Pressing one voice of a chord harder lets a melody emerge from the harmony.

3. Glide

Glide is horizontal finger movement, translated into pitch bend. On a continuous surface it lets you slide between pitches or add vibrato with a rocking motion. Because MPE sends each note on its own channel, one voice can bend while the rest hold steady.

Mapping idea: keep pitch bend range at a sensible value. A wide range suits long glissandi, while a narrower one makes subtle vibrato easier to control. Always make sure your controller and plugin agree on the setting.

4. Slide

Slide is vertical finger movement, forward and back on a key or surface. By convention it is sent as MIDI CC 74 and is often mapped to timbre. It is the most open-ended dimension, which is part of its appeal.

Mapping idea: try wavetable position, filter cutoff, FM amount or effect send. Choose something with a smooth, audible range so small movements are rewarded.

5. Lift

Lift is how you release a note. Release velocity can shape the tail of the sound: a fast flick might cut the note short, while a slow, gentle lift lets it ring out. It is the least commonly supported dimension, so check whether your controller and instrument both implement it.

Mapping idea: use lift to control release time or the level of a tail effect, if your synth can read it.

A short practice routine

Knowing the five names is one thing. Controlling them is another. Here is a routine that takes about ten minutes:

Minutes 1-3, press only. Hold a single note and draw a slow swell up and down with pressure alone. Keep pitch steady.

Minutes 4-6, glide only. Play a note and move to a target pitch by sliding, stopping exactly on it. Repeat across the instrument.

Minutes 7-8, slide only. Hold a chord and move one finger vertically while the others stay perfectly still. This builds finger independence.

Minutes 9-10, combine. Play a two-note interval. Bend one note while pressing the other.

Short daily sessions beat occasional long ones, and recording your practice with MPE data intact lets you hear what your hands actually did.

Where to go next

Controllers that capture these gestures include the ROLI Seaboard, LinnStrument, the Haken Continuum, the Expressive E Osmose and Ableton Push 3. Plugins such as Arturia Pigments, Serum 2, UVI Falcon and the free Surge XT and Vital all respond to MPE.

Start with one dimension at a time. Once each feels natural, combining them stops being a technique and becomes simply how you play.