Recording MIDI

Core Idea

MIDI stands for Musical Instrument Digital Interface. It is not audio. It is data. MIDI records what notes were played, how hard they were hit, how long they were held, and when the pedal was pressed. That data can then trigger any software instrument or hardware synth to make sound.

The big advantage of MIDI is flexibility. A recorded MIDI performance can be edited after the fact. Wrong notes can be dragged to the right pitch. Timing can be quantized. The sound can be changed from a piano to a synth pad without re recording anything. Audio cannot do that.

Recording MIDI requires a controller, which is usually a keyboard with keys that send MIDI data, and a DAW that captures that data and routes it to a software instrument. Once those pieces are in place, MIDI recording works similarly to recording audio but with more editing options after the fact.

Videos

How It Works

A MIDI controller, usually a keyboard, sends messages to the computer every time a key is pressed. Those messages include which note was played, how fast the key was pressed which is called velocity, and how long the key was held down. The DAW records those messages as a MIDI region. When the DAW plays back that region, it sends the same messages to a software instrument which turns the data into sound.

Setting up MIDI recording is straightforward. Connect the MIDI controller to the computer with USB. Most modern controllers do not need additional drivers. In the DAW, create a new software instrument track. Choose a virtual instrument like a synth, piano, drum machine, or strings. Arm the track for recording and start playing. The DAW will record the MIDI data, not the audio coming out of the speakers.

Editing MIDI is where the power really shows up. The piano roll is the most common MIDI editor. It shows each note as a rectangle on a grid. The vertical position determines the pitch. The length determines duration. The color or shading often represents velocity. From the piano roll, notes can be moved, resized, deleted, or added. Timing can be quantized, which snaps notes to the nearest grid line. Velocity can be adjusted to make notes louder or softer.

One useful editing technique is humanization. Quantizing everything perfectly can make MIDI sound robotic and lifeless. Humanization adds small random variations to timing and velocity to make the performance feel more like a real person played it. Most DAWs have a humanize function, or the adjustments can be done manually for more control.

MIDI is not just for keyboards. Drum pads, electronic drum kits, wind controllers, and even guitar pickups can send MIDI data. MIDI can also control parameters like synth filter sweeps, effect sends, and volume faders. The data can be recorded, edited, and played back just like note data.

Summary

MIDI records performance data, not audio. That data can be edited, re quantized, or completely changed after recording. A different software instrument can be loaded and the same MIDI performance will play back with the new sound.

Recording MIDI requires a controller and a DAW with a software instrument. The learning curve is shallow, and the editing capabilities make MIDI essential for modern music production, especially for electronic, pop, and hip hop.

Practical Steps

• Connect a MIDI keyboard controller to the computer using USB. Most work without installing drivers.
• Open the DAW and create a new software instrument track.
• Load a software instrument onto the track. Start with a basic piano or synth patch.
• Arm the track for recording and check that the DAW is receiving MIDI signals from the controller.
• Record a simple part like a chord progression or a melody line.
• Open the piano roll editor to see the recorded notes as rectangles on a grid.
• Drag any wrong notes to the correct pitch by clicking and moving them up or down.
• Resize notes by dragging the left or right edge to change how long they play.
• Use the quantize function to snap notes to the grid. Start with a low strength like 50 percent to keep some human feel.
• Change the software instrument to a different sound and hear the same MIDI performance play back with the new tone.

Common Mistakes

• Thinking MIDI is audio and being confused why the file does not make sound without a software instrument.
• Recording MIDI without monitoring. Some DAWs need monitoring turned on to hear the instrument while playing.
• Quantizing every note to 100 percent and ending up with a stiff, robotic performance.
• Leaving all notes at maximum velocity, which sounds unnatural because real players vary their dynamics.
• Forgetting to set the correct tempo before recording MIDI parts that need to match a specific beat.
• Overloading the session with too many software instrument tracks and causing the computer to slow down.
• Not learning basic keyboard skills and struggling to play even simple parts into the DAW.
• Using the wrong MIDI channel when routing to external hardware synths.
• Recording MIDI with high latency. Check the buffer size and lower it for recording.
• Ignoring MIDI editing tools and treating MIDI recordings like audio that cannot be changed.

Resources

• Making Music with MIDI | Music Production for Beginners
• How to Record and Edit MIDI in Logic Pro
• Logic Pro #08 - MIDI Fundamentals & Software Instruments
• MIDI a beginners guide. What is MIDI, how to use MIDI, do I need MIDI