usb midi keyboard

Common key counts are 25, 49, and 61 keys, covering ultra-compact 25-key controllers up to five-octave 61-key models used for more extensive playability.

Most controllers use USB or USB-C class-compliant connections for plug-and-play with computers and iOS devices. Power options commonly include USB bus power; some models can run on AA batteries or offer optional battery power.

Some controllers include a built-in audio interface with 24-bit/96 kHz conversion, balanced stereo and headphone outputs, a combo input for line/instrument/mic, and 48V phantom power with a Class‑A preamp.

Controllers commonly offer velocity-sensitive pads (typically 8 up to 16 pads), some support pressure/aftertouch on pads, and many include touch strips for pitch/modulation or assignable controls.

Typical controls include faders and encoders/knobs (examples are sets like eight encoders and nine faders), transport and DAW buttons, assignable knobs, and auto-mapped modes for fast workflow control.

Many controllers include a sustain pedal input (1/4" TS). Some models add combo jacks for line/instrument/mic, and units with audio interfaces can offer 48V phantom power for condenser microphones.