Two turntables and a mixer to simple for you?
Then check out Mopho DJ – ‘an alternative to currently available digital hardware interfaces and time-coded vinyl (TCV)’ that’s based on modifying two turntables by taping iPod touches to their surfaces.
Here’s the official explanation:
Similar to TCV, the proposed method leverages existing analog turntables as a physical interface to manipulate the playback of digital audio. To do so, however, an accelerometer/gyroscope–equipped smart phone is firmly attached to a modified record, placed on a turntable, and used to sense a performers movement, resulting in a wireless sensing-based scratching method. The accelerometer and gyroscope data is wirelessly transmitted to a computer to manipulate the digital audio playback in real-time.
The method provides the benefit of digital audio and storage, requires minimal additional hardware, accommodates familiar proprioceptive feedback, and allows a single interface to control both digital and analog audio. In addition, the proposed method provides numerous additional benefits including real-time graphical display, multi-touch interaction, and untethered performance (e.g “air-scratching”).
Such a method turns a vinyl record into an interactive surface and enhances traditional scratching performance, while affording new and creative musical interactions.
Informal testing show this approach to be viable, responsive, and robust.
Before you dismiss this as iCrap, note that this is an academic proof of concept project, using iPod touches as cheap, ‘canned’ devices to transmit position and motion data wirelessly.