Alesis V25 Size Explained
Updated Nov 13, 2026 · By 
Jonah Mercer · Editorial policy
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The Alesis V25 is a 25-key MIDI controller, so its size is set by its key count, its key size, and its width, depth and height.
What the 25 in V25 means
The number in the name is the key count: the V25 has 25 keys. The controllers listed here show the range: the Akai MPK Mini IV has 25 keys, the Akai MPK Mini Plus has 37 keys, and the M-Audio Keystation 49 MK3 and the Novation Launchkey 49 MK4 have 49 keys each. More keys means a wider controller, so the key count is the first figure to check when size matters.
Mini keys versus full-size keys
Key size changes the width as much as the key count does. The M-Audio Keystation 49 MK3 lists 49 full-size velocity-sensitive keys, while the Akai MPK Mini IV lists 25 mini velocity-sensitive keys. Mini keys sit closer together, so a 25-key controller with mini keys takes less desk width than a 25-key controller with full-size keys would. Check whether the listing says mini keys or full-size keys before you compare two widths.
Measure width, depth and height
Listings state size as depth by width by height in inches. The Akai MPK Mini IV lists 7.56 inches deep by 13.88 inches wide by 1.44 inches high, and the Akai MPK Mini Plus lists 7.1 inches deep by 17.9 inches wide by 2 inches high. Measure the space on your desk first, then compare the width figure, since the width is the figure that decides whether the controller fits.
Weight and what travels with it
Weight matters when the controller moves between rooms or travels. The Akai MPK Mini IV lists 2.2 pounds, the M-Audio Keystation 49 MK3 lists 4.9 pounds, and the Novation Launchkey 49 MK4 lists 9 pounds. A lighter controller is easier to carry, but check the listed weight rather than guessing from the key count, since the two 49-key models here list 4.9 pounds and 9 pounds.
Check the connections and the software
Size is not the only figure to check. The M-Audio Keystation 49 MK3 and the Akai MPK Mini IV both list USB-MIDI and Ableton Live Lite, and the Keystation adds a sustain pedal input. The Novation Launchkey 49 MK4 lists 16 pads and 9 faders, and the Akai MPK Mini Plus lists MIDI/CV/Gate outputs. Match the connections and the included software to your setup before you buy.
What you need
M-AUDIO Keystation 49 MK3 USB MIDI Controller
A 49-key controller with full-size velocity-sensitive keys, a volume fader, transport and directional buttons, pitch and modulation wheels, and a sustain pedal input.
- Keys: 49
- Software named in listing: Ableton Live Lite
- USB-MIDI
- 1-year warranty stated
Akai Professional MPK Mini IV 25-Key USB-C
A 25-key controller with mini velocity-sensitive keys, 8 MPC pads, 8 assignable 360-degree knobs, a full-color screen, and USB-C connectivity.
- Keys: 25
- Pads: 8
- Knobs / faders: 8
- Software named in listing: Ableton Live Lite
- USB-MIDI
- 1-year warranty stated
- 2.2 lb, the lightest here
Novation Launchkey 49 MK4 USB MIDI Keyboard
A 49-key controller with semi-weighted keys, 16 pads with polyphonic aftertouch, 9 faders, pitch and modulation wheels, and an OLED display.
- Keys: 49
- Pads: 16
- Knobs / faders: 9
- Aftertouch
- Software named in listing: Ableton Live
- USB-MIDI
- 3-year warranty stated
Akai Professional MPK Mini Plus 37-Key USB
A 37-key controller with mini velocity-sensitive keys, 8 MPC pads, a 64-step sequencer, and MIDI/CV/Gate outputs for other gear.
- Keys: 37
- Pads: 8
- Knobs / faders: 8
- USB-MIDI
- 1-year warranty stated
These come from our ranked list Best MIDI Keyboard, which compares them spec by spec.
Frequently asked questions
How wide is a 25-key MIDI controller?
It depends on the keys. The Akai MPK Mini IV, a 25-key controller with mini keys, lists 13.88 inches wide, so check the width figure on the listing for the model you compare.
How many keys does the Alesis V25 have?
The V25 has 25 keys, next to the 37-key Akai MPK Mini Plus and the 49-key M-Audio Keystation 49 MK3 and Novation Launchkey 49 MK4.
What software comes with these controllers?
It varies by model. The M-Audio Keystation 49 MK3 and the Akai MPK Mini IV both name Ableton Live Lite, and the Novation Launchkey 49 MK4 names Ableton Live, so check the software list on the listing.
Which controller weighs the least?
The Akai MPK Mini IV lists 2.2 pounds, against 4.9 pounds for the M-Audio Keystation 49 MK3 and 9 pounds for the Novation Launchkey 49 MK4.
Ranked MIDI keyboards lists
More how-to guides
Product details come from each Amazon listing and can change. Check the listing before you buy.