It is a free online app that judges your performance by listening to the notes you play through a microphone or sound input.

BBC: Webscape: The app offering free guitar lessons

The researchers have developed ways to control gadgets, such as personal digital assistants (PDAs) and music players, using 3D sound for output and gestures for input.

BBC: NEWS | Technology | 'Body talk' could control mobiles

Contrary to popular belief, aid works well, provided it follows reasonable principles: It is available in sufficient amounts, is precisely targeted to reduce poverty in countries with sound policies and is administered with the full input of local decision makers.

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Mikey Digital also features a multi-source input jack that allows for direct connection of guitars and other sound sources to record with the highest possible fidelity.

ENGADGET: Blue Microphones Mikey Digital portable microphone for iOS devices hits shelves, offers mobile tracking for $100

The new Z-Base sound bars offer two analog audio inputs, one optical (toslink) digital input, one coaxial digital input - plus a front panel 3.5mm analog stereo input for convenient connection of an iPod or other portable audio device.

ENGADGET: ZVOX intros three new Z-Base models, lowers the pricing soundbar

For pristine stereo sound, the P7700 incorporates a built-in stereo microphone, an external microphone input, a HDMI mini connector and HDMI-CEC support.

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Razer's Carcharias headset is yet another audio-related diversion for the input peripheral company, and as with its mighty impressive Mako 2.1 sound system, this here headset was remarkably solid.

ENGADGET: Razer Carcharias headset: unboxing and impressions

The unused input can be sealed with the patent pending V-CORK to accurately balance the sound and prevent corrosion.

ENGADGET: V-Moda ships its listener-influenced Crossfade M-100 headphones