Here's what IK Multimedia say about the I/O 25 Controller:
Built-in professional audio interface
iRig Keys I/O is the only controller range currently available on the market today featuring a professional 24-bit, 96kHz capable audio interface. This keeps cabling to a minimum and makes setting up as fast and easy as just plug and play. For recording the combination input handles 1/4" or XLR sources and provides the best possible audio quality with a Class A preamp for dynamic and condenser mics (including 48V phantom power), to line instruments along with guitars and basses. When used in live performances the 1/4" balanced stereo output allows for long cable runs directly to a PA or mixer which is perfect for keyboard players and DJs. All of this makes iRig Keys I/O the ideal creative tool for studio or live use, in any situation, providing a solution that is more convenient and affordable than having to buy a controller and audio interface separately.
Control with touch
Starting with a fast synth-action keybed that improves on all previous IK keyboards, iRig Keys I/O includes all the controls expected from a premium controller and more. Both models feature a volume/data push knob, 4 touch-sensitive knobs on 2 banks (acting as 8 total controls) and 8 multicoloured LED velocity sensitive pads. There are also 2 fully programmable touch control strips acting by default as Pitch and Modulation controls. A complete touch sensitive transport and button section rounds out the controls available. All knobs, sliders and buttons are touch-sensitive using capacitive technology for ultra-fast action and immediate feedback, displaying the related parameter value just with a simple touch.
Being certified Apple MFi hardware (Made for iPhone and iPad) and thanks to the on-board audio interface, iRig Keys I/O works out of the box with all iOS devices with a Lightning port, including the latest generation iPhone 7 that does not have an audio output jack. The included Lighting cable allows for easy plug-and-play operation with Apple iOS devices and the USB cable connects Mac and PC computers. iRig Keys I/O also works seamlessly with popular Digital Audio Workstation (DAW) software like GarageBand, Logic, Ableton Live and more.
iRig Keys I/O 25 and 49 key versions are the smallest controllers with full-size keys on the market today. This is a great advantage when working in studios or environments where space is at a premium and ideal for the travelling musician, not only for their ultra-compact size but also because they are 25% lighter than the nearest competitor. Furthermore, iRig Keys I/O can be powered by USB, an optional external power supply (that simultaneously charges an iOS device) or with 4 AA batteries for mobile music production anywhere.
Full suite of software included
iRig Keys I/O includes an unrivalled selection of software allowing for complete productions when combined with a DAW or free composing and recording software like GarageBand. Included in both 25 and 49 key versions is Ableton Live 9 Lite digital audio workstation, SampleTank 3 sound and groove workstation with over 43GB and 5000 sounds, T-RackS 4 Deluxe mix and mastering suite with 9 EQ and dynamics processors, and the Syntronik Pro-V vintage synthesizer. Plus, iPhone and iPad users receive the full version of SampleTank.